TY  - CONF
AU  - Paunović, Dunja
AU  - Bjekić, Jovana
AU  - Vulić, Katarina
AU  - Živanović, Marko
AU  - Konstantinović, Uroš
AU  - Stanković, Marija
AU  - Filipović, Saša R.
PY  - 2023
UR  - http://reff.f.bg.ac.rs/handle/123456789/4887
AB  - Associative memory (AM) represents an ability to bind unrelated information into meaningful units and encode them as distinct memories.  AM has been the function of interest in many non-invasive transcranial electrical stimulation (tES) studies aiming to maximize the potential for memory modulation by varying stimulation loci, frequency, and amplitude. In the current study, we aimed to capture the tES modulation potential of AM performance when tailoring the stimulation protocols to the individual brain rhythms. By matching the stimulation frequency to the frequency of each subject’s AM task-induced electrophysiological (EEG) activity in theta spectrum (4-8 Hz), we developed two types of personalized oscillatory protocols: theta-modulated otDCS and transcranial alternating current stimulation (tACS), which we administered alongside the constant transcranial direct current stimulation (tDCS) and a sham condition in the single-blind cross-over experiment. To comparatively assess the effects of different tES protocols delivered over the posterior parietal cortex, we tested the recognition and recall ability of the 42 healthy young adults on paired associate paradigms after each of four conditions. During AM assessment participant’s EEG activity was recorded. Group-level comparisons of each active tES condition against sham did not show differences in AM task performance either on recognition or cued-recall. However, data showed variability in performance depending on the task and the outcome measures. To explore the potential sources of variability in effect expression, analysis of the function-relevant neurophysiological markers is necessary. Therefore, behavioral results will be accompanied by features of underlying brain activity extracted from the EEG signals. Apart from introducing a novel approach to probing AM with personalized tES, this well-powered, multi-protocol, multi-task, and multi-measure study produced a comprehensive dataset that allows exploration of factors that could uncover different patterns in responsiveness to tES, as well as the insight into how neurophysiological changes reflected on the behavioral level.
PB  - Elsevier
C3  - IBRO 11th World Congress of Neuroscience Supplement 1
T1  - Towards understanding the neural underpinnings of associative memory: A tES-EEG study
SP  - 879
UR  - https://hdl.handle.net/21.15107/rcub_reff_4887
ER  - 

@conference{
author = "Paunović, Dunja and Bjekić, Jovana and Vulić, Katarina and Živanović, Marko and Konstantinović, Uroš and Stanković, Marija and Filipović, Saša R.",
year = "2023",
abstract = "Associative memory (AM) represents an ability to bind unrelated information into meaningful units and encode them as distinct memories.  AM has been the function of interest in many non-invasive transcranial electrical stimulation (tES) studies aiming to maximize the potential for memory modulation by varying stimulation loci, frequency, and amplitude. In the current study, we aimed to capture the tES modulation potential of AM performance when tailoring the stimulation protocols to the individual brain rhythms. By matching the stimulation frequency to the frequency of each subject’s AM task-induced electrophysiological (EEG) activity in theta spectrum (4-8 Hz), we developed two types of personalized oscillatory protocols: theta-modulated otDCS and transcranial alternating current stimulation (tACS), which we administered alongside the constant transcranial direct current stimulation (tDCS) and a sham condition in the single-blind cross-over experiment. To comparatively assess the effects of different tES protocols delivered over the posterior parietal cortex, we tested the recognition and recall ability of the 42 healthy young adults on paired associate paradigms after each of four conditions. During AM assessment participant’s EEG activity was recorded. Group-level comparisons of each active tES condition against sham did not show differences in AM task performance either on recognition or cued-recall. However, data showed variability in performance depending on the task and the outcome measures. To explore the potential sources of variability in effect expression, analysis of the function-relevant neurophysiological markers is necessary. Therefore, behavioral results will be accompanied by features of underlying brain activity extracted from the EEG signals. Apart from introducing a novel approach to probing AM with personalized tES, this well-powered, multi-protocol, multi-task, and multi-measure study produced a comprehensive dataset that allows exploration of factors that could uncover different patterns in responsiveness to tES, as well as the insight into how neurophysiological changes reflected on the behavioral level.",
publisher = "Elsevier",
journal = "IBRO 11th World Congress of Neuroscience Supplement 1",
title = "Towards understanding the neural underpinnings of associative memory: A tES-EEG study",
pages = "879",
url = "https://hdl.handle.net/21.15107/rcub_reff_4887"
}

Paunović, D., Bjekić, J., Vulić, K., Živanović, M., Konstantinović, U., Stanković, M.,& Filipović, S. R.. (2023). Towards understanding the neural underpinnings of associative memory: A tES-EEG study. in IBRO 11th World Congress of Neuroscience Supplement 1
Elsevier., 879.
https://hdl.handle.net/21.15107/rcub_reff_4887

Paunović D, Bjekić J, Vulić K, Živanović M, Konstantinović U, Stanković M, Filipović SR. Towards understanding the neural underpinnings of associative memory: A tES-EEG study. in IBRO 11th World Congress of Neuroscience Supplement 1. 2023;:879.
https://hdl.handle.net/21.15107/rcub_reff_4887 .

Paunović, Dunja, Bjekić, Jovana, Vulić, Katarina, Živanović, Marko, Konstantinović, Uroš, Stanković, Marija, Filipović, Saša R., "Towards understanding the neural underpinnings of associative memory: A tES-EEG study" in IBRO 11th World Congress of Neuroscience Supplement 1 (2023):879,
https://hdl.handle.net/21.15107/rcub_reff_4887 .

TY  - CONF
AU  - Bjekić, Jovana
AU  - Paunović, Dunja
AU  - Živanović, Marko
AU  - Stanković, Marija
AU  - Griškova-Bulanova, Inga
AU  - Filipović, Saša R.
PY  - 2023
UR  - http://reff.f.bg.ac.rs/handle/123456789/4853
AB  - Objectives:
To develop and evaluate a new approach for determining individual theta frequency (ITF) in EEG data recorded during an associative memory task, that can be used for personalization of frequency-modulated electrical brain stimulation (tACS, otDCS).
Content:
Non-invasive brain stimulation (NIBS) methods have gained increased interest in research and therapy of associative memory (AM) and its impairments. However, the one-size-fits-all approach
yields inconsistent findings, thus putting forward the need for electroencephalography (EEG) guided personalized frequency-modulated transcranial electrical stimulation (tES) protocols to increase the focality and the effectiveness of the interventions. Still, extraction of individual frequency, especially in the theta band, turned out to be a challenging task. We present an approach to extracting the individual theta-band frequency (ITF) from context-dependent EEG signals recorded during the AM task. The method showed a 93% success rate, good reliability, and a full range of variability of the extracted ITFs. The method considers the individual differences in
theta-peak latencies and enables quantification of the within-person reliability of the extracted ITF. The approach has been implemented in a healthy-subjects experiment assessing the neurophysiological and behavioral effects of ITF-tES. We will discuss the implementation of the method and how ITF could be used as an input parameter for personalized frequency-modulated NIBS approaches—transcranial alternating current stimulation (tACS) and transcranial oscillatory direct current stimulation (otDCS) directed at AM neuromodulation.
C3  - Clinical Neurophysiology
T1  - Individual theta frequency for associative memory targeted personalized transcranial electrical stimulation
EP  - e122
SP  - e121
VL  - 150
DO  - 10.1016/j.clinph.2023.03.154
ER  - 

@conference{
author = "Bjekić, Jovana and Paunović, Dunja and Živanović, Marko and Stanković, Marija and Griškova-Bulanova, Inga and Filipović, Saša R.",
year = "2023",
abstract = "Objectives:
To develop and evaluate a new approach for determining individual theta frequency (ITF) in EEG data recorded during an associative memory task, that can be used for personalization of frequency-modulated electrical brain stimulation (tACS, otDCS).
Content:
Non-invasive brain stimulation (NIBS) methods have gained increased interest in research and therapy of associative memory (AM) and its impairments. However, the one-size-fits-all approach
yields inconsistent findings, thus putting forward the need for electroencephalography (EEG) guided personalized frequency-modulated transcranial electrical stimulation (tES) protocols to increase the focality and the effectiveness of the interventions. Still, extraction of individual frequency, especially in the theta band, turned out to be a challenging task. We present an approach to extracting the individual theta-band frequency (ITF) from context-dependent EEG signals recorded during the AM task. The method showed a 93% success rate, good reliability, and a full range of variability of the extracted ITFs. The method considers the individual differences in
theta-peak latencies and enables quantification of the within-person reliability of the extracted ITF. The approach has been implemented in a healthy-subjects experiment assessing the neurophysiological and behavioral effects of ITF-tES. We will discuss the implementation of the method and how ITF could be used as an input parameter for personalized frequency-modulated NIBS approaches—transcranial alternating current stimulation (tACS) and transcranial oscillatory direct current stimulation (otDCS) directed at AM neuromodulation.",
journal = "Clinical Neurophysiology",
title = "Individual theta frequency for associative memory targeted personalized transcranial electrical stimulation",
pages = "e122-e121",
volume = "150",
doi = "10.1016/j.clinph.2023.03.154"
}

Bjekić, J., Paunović, D., Živanović, M., Stanković, M., Griškova-Bulanova, I.,& Filipović, S. R.. (2023). Individual theta frequency for associative memory targeted personalized transcranial electrical stimulation. in Clinical Neurophysiology, 150, e121-e122.
https://doi.org/10.1016/j.clinph.2023.03.154

Bjekić J, Paunović D, Živanović M, Stanković M, Griškova-Bulanova I, Filipović SR. Individual theta frequency for associative memory targeted personalized transcranial electrical stimulation. in Clinical Neurophysiology. 2023;150:e121-e122.
doi:10.1016/j.clinph.2023.03.154 .

Bjekić, Jovana, Paunović, Dunja, Živanović, Marko, Stanković, Marija, Griškova-Bulanova, Inga, Filipović, Saša R., "Individual theta frequency for associative memory targeted personalized transcranial electrical stimulation" in Clinical Neurophysiology, 150 (2023):e121-e122,
https://doi.org/10.1016/j.clinph.2023.03.154 . .

TY  - CONF
AU  - Živanović, Marko
AU  - Đukić, Bojana
AU  - Stanković, Marija
AU  - Paunović, Dunja
AU  - Konstantinović, Uroš
AU  - Bjekić, Jovana
AU  - Filipović, Saša R.
PY  - 2023
UR  - http://reff.f.bg.ac.rs/handle/123456789/4886
AB  - Implementation of non-invasive brain stimulation (NIBS) methods in research has been extremely successful in expanding the knowledge of neural mechanisms behind distinct cognitive processes. A form of NIBS, Transcranial Direct Current Stimulation (tDCS), has increasingly been used over the past decade as a potential tool for the modulation of cognitive functions. Although tDCS has been shown to have neurophysiological and behavioural impacts on a variety of cognitive functions, the results are frequently inconsistent. Among many potential factors that could contribute to the variability of the findings, the participants' emotional state is one that seems to be frequently overlooked. In the present study, we aimed to determine whether participants' emotional states influenced tDCS effects on associative (AM) and working memory (WM) performance. We analysed the results from six within-subject, sham-controlled tDCS experiments involving a total of 144 young, healthy volunteers. In each experiment, parallel forms of either AM or WM tasks were used to assess the effects of real vs. sham tDCS. The emotional state was assessed before each tDCS session using the Depression Anxiety Stress Scales (DASS) questionnaire. The results did not show a systematic effect of variations in the emotional state across sessions on the tDCS effects. Namely, neither variations in depression, anxiety, nor stress acted as a systemic modulator of tDCS effects on memory outcomes across different experiments. Nevertheless, in some of the experiments, either depressiveness or stress was found to modulate the tDCS effects. This would suggest that variability in the emotional state should be taken into account when assessing tDCS effects, especially at the individual level.
PB  - Oxford: Elsevier Ltd.
C3  - IBRO 11th World Congress of Neuroscience Supplement 1
T1  - Do variations in emotional state modulate the effects of transcranial direct current stimulation (tDCS) on memory in healthy human participants?
SP  - P1726 / #2688
DO  - 10.1016/j.ibneur.2023.08.1732
UR  - https://hdl.handle.net/21.15107/rcub_reff_4886
ER  - 

@conference{
author = "Živanović, Marko and Đukić, Bojana and Stanković, Marija and Paunović, Dunja and Konstantinović, Uroš and Bjekić, Jovana and Filipović, Saša R.",
year = "2023",
abstract = "Implementation of non-invasive brain stimulation (NIBS) methods in research has been extremely successful in expanding the knowledge of neural mechanisms behind distinct cognitive processes. A form of NIBS, Transcranial Direct Current Stimulation (tDCS), has increasingly been used over the past decade as a potential tool for the modulation of cognitive functions. Although tDCS has been shown to have neurophysiological and behavioural impacts on a variety of cognitive functions, the results are frequently inconsistent. Among many potential factors that could contribute to the variability of the findings, the participants' emotional state is one that seems to be frequently overlooked. In the present study, we aimed to determine whether participants' emotional states influenced tDCS effects on associative (AM) and working memory (WM) performance. We analysed the results from six within-subject, sham-controlled tDCS experiments involving a total of 144 young, healthy volunteers. In each experiment, parallel forms of either AM or WM tasks were used to assess the effects of real vs. sham tDCS. The emotional state was assessed before each tDCS session using the Depression Anxiety Stress Scales (DASS) questionnaire. The results did not show a systematic effect of variations in the emotional state across sessions on the tDCS effects. Namely, neither variations in depression, anxiety, nor stress acted as a systemic modulator of tDCS effects on memory outcomes across different experiments. Nevertheless, in some of the experiments, either depressiveness or stress was found to modulate the tDCS effects. This would suggest that variability in the emotional state should be taken into account when assessing tDCS effects, especially at the individual level.",
publisher = "Oxford: Elsevier Ltd.",
journal = "IBRO 11th World Congress of Neuroscience Supplement 1",
title = "Do variations in emotional state modulate the effects of transcranial direct current stimulation (tDCS) on memory in healthy human participants?",
pages = "P1726 / #2688",
doi = "10.1016/j.ibneur.2023.08.1732",
url = "https://hdl.handle.net/21.15107/rcub_reff_4886"
}

Živanović, M., Đukić, B., Stanković, M., Paunović, D., Konstantinović, U., Bjekić, J.,& Filipović, S. R.. (2023). Do variations in emotional state modulate the effects of transcranial direct current stimulation (tDCS) on memory in healthy human participants?. in IBRO 11th World Congress of Neuroscience Supplement 1
Oxford: Elsevier Ltd.., P1726 / #2688.
https://doi.org/10.1016/j.ibneur.2023.08.1732
https://hdl.handle.net/21.15107/rcub_reff_4886

Živanović M, Đukić B, Stanković M, Paunović D, Konstantinović U, Bjekić J, Filipović SR. Do variations in emotional state modulate the effects of transcranial direct current stimulation (tDCS) on memory in healthy human participants?. in IBRO 11th World Congress of Neuroscience Supplement 1. 2023;:P1726 / #2688.
doi:10.1016/j.ibneur.2023.08.1732
https://hdl.handle.net/21.15107/rcub_reff_4886 .

Živanović, Marko, Đukić, Bojana, Stanković, Marija, Paunović, Dunja, Konstantinović, Uroš, Bjekić, Jovana, Filipović, Saša R., "Do variations in emotional state modulate the effects of transcranial direct current stimulation (tDCS) on memory in healthy human participants?" in IBRO 11th World Congress of Neuroscience Supplement 1 (2023):P1726 / #2688,
https://doi.org/10.1016/j.ibneur.2023.08.1732 .,
https://hdl.handle.net/21.15107/rcub_reff_4886 .

TY  - CONF
AU  - Živanović, Marko
AU  - Bjekić, Jovana
AU  - Konstantinović, Uroš
AU  - Filipović, Saša R.
PY  - 2023
UR  - http://reff.f.bg.ac.rs/handle/123456789/4856
AB  - Objectives:
To comparatively assess the online effects of constant anodal tDCS, oscillatory tDCS, and tACS over the left posterior parietal cortex on the short-term associative memory.
Content:
Transcranial electric stimulation (tES) techniques are promising tools for the neuromodulation of memory functions. Here, we comparatively assess the online effects of three tES protocols over the left posterior parietal cortex on the short-term associative memory (AM): oscillatory tDCS (otDCS, 1.5 mA ± 0.5 mA), tACS (0 ± 1 mA), both delivered at personalized theta frequency (4–8 Hz) and constant anodal tDCS (1.5 mA). Forty participants took part in a sham-controlled cross-over experiment where they received different tES protocols in separate sessions (tDCS/otDCS/tACS/sham) while performing parallel forms of the short-term AM task. In AM task, single digits were successively presented on the cards of different colors (digit-color associations). The length of sequences varied between three (low-demand) to five stimuli (high-demand). The participant’s task was to remember digit-color associations presented in each sequence. At the end of each sequence, participants were shown one of the previously seen color cards, and they needed to recall the digit that was presented on a given card. Results showed that
participants outperformed sham in all three real tES conditions. Despite comparable effectiveness, the effects of tES protocols varied depending on the task demand, with tDCS being more beneficial
when the memory demand was low, while theta-modulated tACS and otDCS predominantly promoted short-term AM when the memory load was high. The results indicate that tDCS, otDCS, and tACS, due to their different modes of action, potentially affect different memory processes.
C3  - Clinical Neurophysiology
T1  - A direct comparison of tDCS, theta tACS, and theta‑oscillatory tDCS effects on short-term associative memory
EP  - e122
SP  - e122
VL  - 150
DO  - 10.1016/j.clinph.2023.03.156
ER  - 

@conference{
author = "Živanović, Marko and Bjekić, Jovana and Konstantinović, Uroš and Filipović, Saša R.",
year = "2023",
abstract = "Objectives:
To comparatively assess the online effects of constant anodal tDCS, oscillatory tDCS, and tACS over the left posterior parietal cortex on the short-term associative memory.
Content:
Transcranial electric stimulation (tES) techniques are promising tools for the neuromodulation of memory functions. Here, we comparatively assess the online effects of three tES protocols over the left posterior parietal cortex on the short-term associative memory (AM): oscillatory tDCS (otDCS, 1.5 mA ± 0.5 mA), tACS (0 ± 1 mA), both delivered at personalized theta frequency (4–8 Hz) and constant anodal tDCS (1.5 mA). Forty participants took part in a sham-controlled cross-over experiment where they received different tES protocols in separate sessions (tDCS/otDCS/tACS/sham) while performing parallel forms of the short-term AM task. In AM task, single digits were successively presented on the cards of different colors (digit-color associations). The length of sequences varied between three (low-demand) to five stimuli (high-demand). The participant’s task was to remember digit-color associations presented in each sequence. At the end of each sequence, participants were shown one of the previously seen color cards, and they needed to recall the digit that was presented on a given card. Results showed that
participants outperformed sham in all three real tES conditions. Despite comparable effectiveness, the effects of tES protocols varied depending on the task demand, with tDCS being more beneficial
when the memory demand was low, while theta-modulated tACS and otDCS predominantly promoted short-term AM when the memory load was high. The results indicate that tDCS, otDCS, and tACS, due to their different modes of action, potentially affect different memory processes.",
journal = "Clinical Neurophysiology",
title = "A direct comparison of tDCS, theta tACS, and theta‑oscillatory tDCS effects on short-term associative memory",
pages = "e122-e122",
volume = "150",
doi = "10.1016/j.clinph.2023.03.156"
}

Živanović, M., Bjekić, J., Konstantinović, U.,& Filipović, S. R.. (2023). A direct comparison of tDCS, theta tACS, and theta‑oscillatory tDCS effects on short-term associative memory. in Clinical Neurophysiology, 150, e122-e122.
https://doi.org/10.1016/j.clinph.2023.03.156

Živanović M, Bjekić J, Konstantinović U, Filipović SR. A direct comparison of tDCS, theta tACS, and theta‑oscillatory tDCS effects on short-term associative memory. in Clinical Neurophysiology. 2023;150:e122-e122.
doi:10.1016/j.clinph.2023.03.156 .

Živanović, Marko, Bjekić, Jovana, Konstantinović, Uroš, Filipović, Saša R., "A direct comparison of tDCS, theta tACS, and theta‑oscillatory tDCS effects on short-term associative memory" in Clinical Neurophysiology, 150 (2023):e122-e122,
https://doi.org/10.1016/j.clinph.2023.03.156 . .

TY  - BOOK
AU  - Živanović, Marko
AU  - Bjekić, Jovana
PY  - 2023
UR  - http://reff.f.bg.ac.rs/handle/123456789/5769
AB  - Mogućnost neinvazivne neuromodulacije moždane aktivnosti
otvorila je potpuno novo polje istraživanja u kognitivnim
neuronaukama. Sada po prvi put možemo na bezbedan i
reverzibilan način uticati na moždanu aktivnost i registrovati
efekte na različite psihičke funkcije. Svaki istraživač
zainteresovan za razumevanje ljudske kognicije prepoznaće u
ovome neverovatan saznajni potencijal – pored toga što
možemo registrovati moždanu aktivnost dok obavljamo neki
kognitivni zadatak, otvara se mogućnost da njome i
manipulišemo.
Upravo navedena uzbudljiva ideja privukla je nas, a i mnoge
psihologe, da uplovimo u oblast neinvazivne neuromodulacije.
Čim smo počeli da istražujemo literaturu, shvatili smo da
ulazimo u suštinski multidisciplinarnu oblast istraživanja, sa
velikim brojem neodgonetnutih pitanja. Naime, da bismo
razumeli način na koji uređaji za neinvazivnu neuromodulaciju
rade, potrebna su znanja iz biofizike; da bismo razumeli kakve
efekte ostvaruju na nervni sistem, neophodna su znanja iz
neurofiziologije centralnog nervnog sistema; kako bismo
donosili odluke o mestu stimulacije, neophodno je
razumevanje neuroanatomije i funkcionalnih veza između
različitih delova mozga; kako bismo na adekvatan način merili
efekte na kognitivne funkcije, moramo se osloniti na znanja iz
eksperimentalne psihologije i psihometrije.
Ova knjiga pisana je iz ugla psihologa istraživača koji su
primarno zainteresovani za primenu metoda neinvazivne
neuromodulacije u cilju boljeg razumevanja kognitivnih
2
procesa i funkcija kroz istraživanje njihovih neuralnih osnova.
Većina knjiga koje obrađuju metode neinvazivne
neuromodulacije pisane su iz perspektive inženjera usmerenih
na razumevanje biofizike ovih metoda i dalji razvoj tehnoloških
inovacija, što ih često čini veoma tehničkim i teškim za praćenje.
Sa druge strane, postoje knjige i priručnici s fokusom na
primeni metoda neinvazivne neuromodulacije u lečenju
različitih neuroloških i psihijatrijskih oboljenja, koji detaljno
obrađuju neurofiziološke aspekte i neurobiološke mehanizme
delovanja. Ipak, takve studije su pisane kako bi upoznale lekare
sa mogućnostima, potencijalima i dometima ovih tehnika u
kliničkoj praksi, te po pravilu ne obuhvataju istraživačku
perspektivu primene metoda neinvazivne neuromodulacije sa
ciljem boljeg razumevanja kognitivnih funkcija. Ova knjiga
namenjena je primarno psiholozima i drugim istraživačima
zainteresovanim za kognitivne neuronauke, ali je za razliku od
postojećih monografija i udžbenika (npr. Uvod u kognitivne
neuronauke, Filipović-Đurđević i Zdravković, 2013) tematski
fokusirana na metode i tehnike neinvazivne neuromodulacije i
aspekte istraživanja relevantne za njihovu primenu.
PB  - Beograd : Institut za psihologiju
T1  - Transkranijalna električna stimulacija u kognitivnim neuronaukama
UR  - https://hdl.handle.net/21.15107/rcub_reff_5769
ER  - 

@book{
author = "Živanović, Marko and Bjekić, Jovana",
year = "2023",
abstract = "Mogućnost neinvazivne neuromodulacije moždane aktivnosti
otvorila je potpuno novo polje istraživanja u kognitivnim
neuronaukama. Sada po prvi put možemo na bezbedan i
reverzibilan način uticati na moždanu aktivnost i registrovati
efekte na različite psihičke funkcije. Svaki istraživač
zainteresovan za razumevanje ljudske kognicije prepoznaće u
ovome neverovatan saznajni potencijal – pored toga što
možemo registrovati moždanu aktivnost dok obavljamo neki
kognitivni zadatak, otvara se mogućnost da njome i
manipulišemo.
Upravo navedena uzbudljiva ideja privukla je nas, a i mnoge
psihologe, da uplovimo u oblast neinvazivne neuromodulacije.
Čim smo počeli da istražujemo literaturu, shvatili smo da
ulazimo u suštinski multidisciplinarnu oblast istraživanja, sa
velikim brojem neodgonetnutih pitanja. Naime, da bismo
razumeli način na koji uređaji za neinvazivnu neuromodulaciju
rade, potrebna su znanja iz biofizike; da bismo razumeli kakve
efekte ostvaruju na nervni sistem, neophodna su znanja iz
neurofiziologije centralnog nervnog sistema; kako bismo
donosili odluke o mestu stimulacije, neophodno je
razumevanje neuroanatomije i funkcionalnih veza između
različitih delova mozga; kako bismo na adekvatan način merili
efekte na kognitivne funkcije, moramo se osloniti na znanja iz
eksperimentalne psihologije i psihometrije.
Ova knjiga pisana je iz ugla psihologa istraživača koji su
primarno zainteresovani za primenu metoda neinvazivne
neuromodulacije u cilju boljeg razumevanja kognitivnih
2
procesa i funkcija kroz istraživanje njihovih neuralnih osnova.
Većina knjiga koje obrađuju metode neinvazivne
neuromodulacije pisane su iz perspektive inženjera usmerenih
na razumevanje biofizike ovih metoda i dalji razvoj tehnoloških
inovacija, što ih često čini veoma tehničkim i teškim za praćenje.
Sa druge strane, postoje knjige i priručnici s fokusom na
primeni metoda neinvazivne neuromodulacije u lečenju
različitih neuroloških i psihijatrijskih oboljenja, koji detaljno
obrađuju neurofiziološke aspekte i neurobiološke mehanizme
delovanja. Ipak, takve studije su pisane kako bi upoznale lekare
sa mogućnostima, potencijalima i dometima ovih tehnika u
kliničkoj praksi, te po pravilu ne obuhvataju istraživačku
perspektivu primene metoda neinvazivne neuromodulacije sa
ciljem boljeg razumevanja kognitivnih funkcija. Ova knjiga
namenjena je primarno psiholozima i drugim istraživačima
zainteresovanim za kognitivne neuronauke, ali je za razliku od
postojećih monografija i udžbenika (npr. Uvod u kognitivne
neuronauke, Filipović-Đurđević i Zdravković, 2013) tematski
fokusirana na metode i tehnike neinvazivne neuromodulacije i
aspekte istraživanja relevantne za njihovu primenu.",
publisher = "Beograd : Institut za psihologiju",
title = "Transkranijalna električna stimulacija u kognitivnim neuronaukama",
url = "https://hdl.handle.net/21.15107/rcub_reff_5769"
}

Živanović, M.,& Bjekić, J.. (2023). Transkranijalna električna stimulacija u kognitivnim neuronaukama. 
Beograd : Institut za psihologiju..
https://hdl.handle.net/21.15107/rcub_reff_5769

Živanović M, Bjekić J. Transkranijalna električna stimulacija u kognitivnim neuronaukama. 2023;.
https://hdl.handle.net/21.15107/rcub_reff_5769 .

Živanović, Marko, Bjekić, Jovana, "Transkranijalna električna stimulacija u kognitivnim neuronaukama" (2023),
https://hdl.handle.net/21.15107/rcub_reff_5769 .

TY  - JOUR
AU  - Griškova-Bulanova, Inga
AU  - Živanović, Marko
AU  - Voicikas, Aleksandras
AU  - Pipinis, Evaldas
AU  - Jurkuvenas, Vytautas
AU  - Bjekić, Jovana
PY  - 2023
UR  - http://reff.f.bg.ac.rs/handle/123456789/4225
AB  - The link between the state of networks underlying the generation of periodic responses at gamma ranges and cognitive outcomes is still poorly understood. In this study, we tested the idea that the individual differences in the ability to generate responses to auditory stimulation at gamma frequencies may underlie the individual differences in the inhibitory control. We focused on the processing speed and accuracy in the Bivalent Shape Task (a cognitive inhibition task assessing
attentional interference) and explored the relationship with responses at 40 Hz and at individual gamma frequencies (IGFs, assessed utilizing auditory envelope-following responses in 30–60 Hz range). In a sample of 70 subjects, we show that individual measures (phase-locking index and event-related spectral perturbation) of the ability to generate gamma-range activity are not related to the individual differences in inhibitory control but rather reflect basic information processing speed in healthy young subjects. With the individualized approach (at IGFs), the observed associations were found to be somewhat stronger. These findings have important implications for the interpretation of gamma activity in neuropsychiatric disorders.
PB  - Basel : MDPI
T2  - Journal of Personalized Medicine
T1  - Responses at individual gamma frequencies are related to the processing speed but not the inhibitory control
IS  - 1
SP  - 26
VL  - 13
DO  - https://doi.org/10.3390/jpm13010026
ER  - 

@article{
author = "Griškova-Bulanova, Inga and Živanović, Marko and Voicikas, Aleksandras and Pipinis, Evaldas and Jurkuvenas, Vytautas and Bjekić, Jovana",
year = "2023",
abstract = "The link between the state of networks underlying the generation of periodic responses at gamma ranges and cognitive outcomes is still poorly understood. In this study, we tested the idea that the individual differences in the ability to generate responses to auditory stimulation at gamma frequencies may underlie the individual differences in the inhibitory control. We focused on the processing speed and accuracy in the Bivalent Shape Task (a cognitive inhibition task assessing
attentional interference) and explored the relationship with responses at 40 Hz and at individual gamma frequencies (IGFs, assessed utilizing auditory envelope-following responses in 30–60 Hz range). In a sample of 70 subjects, we show that individual measures (phase-locking index and event-related spectral perturbation) of the ability to generate gamma-range activity are not related to the individual differences in inhibitory control but rather reflect basic information processing speed in healthy young subjects. With the individualized approach (at IGFs), the observed associations were found to be somewhat stronger. These findings have important implications for the interpretation of gamma activity in neuropsychiatric disorders.",
publisher = "Basel : MDPI",
journal = "Journal of Personalized Medicine",
title = "Responses at individual gamma frequencies are related to the processing speed but not the inhibitory control",
number = "1",
pages = "26",
volume = "13",
doi = "https://doi.org/10.3390/jpm13010026"
}

Griškova-Bulanova, I., Živanović, M., Voicikas, A., Pipinis, E., Jurkuvenas, V.,& Bjekić, J.. (2023). Responses at individual gamma frequencies are related to the processing speed but not the inhibitory control. in Journal of Personalized Medicine
Basel : MDPI., 13(1), 26.
https://doi.org/https://doi.org/10.3390/jpm13010026

Griškova-Bulanova I, Živanović M, Voicikas A, Pipinis E, Jurkuvenas V, Bjekić J. Responses at individual gamma frequencies are related to the processing speed but not the inhibitory control. in Journal of Personalized Medicine. 2023;13(1):26.
doi:https://doi.org/10.3390/jpm13010026 .

Griškova-Bulanova, Inga, Živanović, Marko, Voicikas, Aleksandras, Pipinis, Evaldas, Jurkuvenas, Vytautas, Bjekić, Jovana, "Responses at individual gamma frequencies are related to the processing speed but not the inhibitory control" in Journal of Personalized Medicine, 13, no. 1 (2023):26,
https://doi.org/https://doi.org/10.3390/jpm13010026 . .

TY  - CONF
AU  - Bjekić, Jovana
AU  - Živanović, Marko
AU  - Paunović, Dunja
AU  - Vulić, Katarina
AU  - Konstantinović, Uroš
AU  - Stanković, Marija
AU  - Filipović, Saša R.
PY  - 2022
UR  - http://reff.f.bg.ac.rs/handle/123456789/4859
AB  - Noninvasive brain stimulation (NIBS) has gained increased interest in research of associative memory (AM) and its impairments. However, the one-size-fits-all approach yields inconsistent findings, thus putting forward the need for the development of personalized frequency-modulated NIBS protocols to increase the focality and the effectiveness of the interventions. Specifically, transcranial altering current stimulation (tACS) and transcranial oscillatory current stimulation (otDCS) with theta-band frequencies (4-8Hz) are promising path for further AM-directed neuromodulation. The aim of the current study was (1) to develop a method for extracting the individual theta-band frequency (ITF) to be used as an input parameter for personalized theta-modulated tACS and otDCS; (2) to assess the effects of tACS and otDCS in comparison to constant anodal tDCS and sham on different AM measures including short-term AM, delayed recognition, and cued recall. In a sample of 42 healthy volunteers, we extracted the frequencies with the highest event-related spectral perturbation from 19 overlapping time windows and six centroparietal electrodes from the EEG signal recorded during successful encoding in an AM task. The ITF was defined as modal frequency (4-8 Hz in 0.5 Hz steps) in the time x electrode matrix. The method showed a 93% success rate, good reliability, and a full range of variability of the extracted ITFs. In a cross-over counterbalanced design, different stimulation protocols (tACS/otDCS/tDCS/sham) were delivered in separate sessions (7 days apart) for 20 minutes over the posterior parietal cortex. Results showed either AM enhancement or no effects of tACS/otDCS/tDCS, depending on the outcome measure that was used. We will discuss individual differences in theta-band activity during AM encoding, together with ITF-extraction challenges and possible methodological and conceptual explanations for the inconsistent effects.
C3  - Clinical Neurophysiology
T1  - Personalized theta frequency-modulated transcranial electric stimulation for associative memory improvement
SP  - S2
VL  - 141
DO  - 10.1016/j.clinph.2022.07.008
ER  - 

@conference{
author = "Bjekić, Jovana and Živanović, Marko and Paunović, Dunja and Vulić, Katarina and Konstantinović, Uroš and Stanković, Marija and Filipović, Saša R.",
year = "2022",
abstract = "Noninvasive brain stimulation (NIBS) has gained increased interest in research of associative memory (AM) and its impairments. However, the one-size-fits-all approach yields inconsistent findings, thus putting forward the need for the development of personalized frequency-modulated NIBS protocols to increase the focality and the effectiveness of the interventions. Specifically, transcranial altering current stimulation (tACS) and transcranial oscillatory current stimulation (otDCS) with theta-band frequencies (4-8Hz) are promising path for further AM-directed neuromodulation. The aim of the current study was (1) to develop a method for extracting the individual theta-band frequency (ITF) to be used as an input parameter for personalized theta-modulated tACS and otDCS; (2) to assess the effects of tACS and otDCS in comparison to constant anodal tDCS and sham on different AM measures including short-term AM, delayed recognition, and cued recall. In a sample of 42 healthy volunteers, we extracted the frequencies with the highest event-related spectral perturbation from 19 overlapping time windows and six centroparietal electrodes from the EEG signal recorded during successful encoding in an AM task. The ITF was defined as modal frequency (4-8 Hz in 0.5 Hz steps) in the time x electrode matrix. The method showed a 93% success rate, good reliability, and a full range of variability of the extracted ITFs. In a cross-over counterbalanced design, different stimulation protocols (tACS/otDCS/tDCS/sham) were delivered in separate sessions (7 days apart) for 20 minutes over the posterior parietal cortex. Results showed either AM enhancement or no effects of tACS/otDCS/tDCS, depending on the outcome measure that was used. We will discuss individual differences in theta-band activity during AM encoding, together with ITF-extraction challenges and possible methodological and conceptual explanations for the inconsistent effects.",
journal = "Clinical Neurophysiology",
title = "Personalized theta frequency-modulated transcranial electric stimulation for associative memory improvement",
pages = "S2",
volume = "141",
doi = "10.1016/j.clinph.2022.07.008"
}

Bjekić, J., Živanović, M., Paunović, D., Vulić, K., Konstantinović, U., Stanković, M.,& Filipović, S. R.. (2022). Personalized theta frequency-modulated transcranial electric stimulation for associative memory improvement. in Clinical Neurophysiology, 141, S2.
https://doi.org/10.1016/j.clinph.2022.07.008

Bjekić J, Živanović M, Paunović D, Vulić K, Konstantinović U, Stanković M, Filipović SR. Personalized theta frequency-modulated transcranial electric stimulation for associative memory improvement. in Clinical Neurophysiology. 2022;141:S2.
doi:10.1016/j.clinph.2022.07.008 .

Bjekić, Jovana, Živanović, Marko, Paunović, Dunja, Vulić, Katarina, Konstantinović, Uroš, Stanković, Marija, Filipović, Saša R., "Personalized theta frequency-modulated transcranial electric stimulation for associative memory improvement" in Clinical Neurophysiology, 141 (2022):S2,
https://doi.org/10.1016/j.clinph.2022.07.008 . .

TY  - CONF
AU  - Stanković, Marija
AU  - Živanović, Marko
AU  - Bjekić, Jovana
AU  - Filipović, Saša R.
PY  - 2022
UR  - http://reff.f.bg.ac.rs/handle/123456789/4858
AB  - In recent years, non-invasive brain stimulation (NIBS) techniques have shown promising effects on cognitive enhancement. Transcranial direct current stimulation (tDCS) is one of the most widely used NIBS techniques in cognitive neuroscience. Even though the neurophysiological and behavioral effects of tDCS have been demonstrated across a wide range of cognitive and motor functions, the findings were not always consistent. Hence, there is an increasing interest in factors that may moderate the effects, one of which could be the participants’ beliefs of the tDCS condition (i.e., real or sham) they received. Thus, this study aimed to explore if participants’ beliefs about received stimulation type (i.e., the success of blinding) impacted their task performance in tDCS experiments on associative memory (AM) and working memory (WM). We analyzed data from
four within-subject, sham-controlled tDCS experiments (N = 83). Two AM experiments included 20 minutes of anodal 1.5mA tDCS over the posterior-parietal cortex (PPC) – left hemisphere in Experiment 1; right hemisphere in Experiment 2. WM experiments targeted PPC and dorsolateral prefrontal cortex – left side in Experiment 3; right side in Experiment 4, with 20 minutes of 1.8mA anodal tDCS. The participants completed memory tasks after the stimulation. The order of the sessions was counterbalanced across participants. At the end of the last session, they were asked to try to guess the session in which they received sham stimulation. We found no evidence that sham guessing moderated post-tDCS memory performance in experiments in which tDCS effects were observed as well as in those that showed null effects of tDCS. Specifically, we found no evidence for the interaction between actual stimulation condition and correct sham-guessing across all experiments and outcome measures (p-values range 0.12 – 0.99). Also, correct sham-guessing had no effect on the AM or WM improvement following active stimulation in the joint analysis performed on a single dataset combined from all experiments (F(1,248) = 1.61, p = 0.21, partial eta squared = 0.01, BF10 = 0.31). The results suggest that the placebo-like effect stemming from participants’ beliefs about the stimulation type they received is unlikely to influence the results
in tDCS memory experiments. We discuss the results in light of the growing debate about the relevance and effectiveness of blinding in brain stimulation research.
C3  - Clinical Neurophysiology
T1  - Correct end-of-study guess does not moderate the effects of tDCS on associative and working memory
SP  - S3
VL  - 141
DO  - 10.1016/j.clinph.2022.07.010
ER  - 

@conference{
author = "Stanković, Marija and Živanović, Marko and Bjekić, Jovana and Filipović, Saša R.",
year = "2022",
abstract = "In recent years, non-invasive brain stimulation (NIBS) techniques have shown promising effects on cognitive enhancement. Transcranial direct current stimulation (tDCS) is one of the most widely used NIBS techniques in cognitive neuroscience. Even though the neurophysiological and behavioral effects of tDCS have been demonstrated across a wide range of cognitive and motor functions, the findings were not always consistent. Hence, there is an increasing interest in factors that may moderate the effects, one of which could be the participants’ beliefs of the tDCS condition (i.e., real or sham) they received. Thus, this study aimed to explore if participants’ beliefs about received stimulation type (i.e., the success of blinding) impacted their task performance in tDCS experiments on associative memory (AM) and working memory (WM). We analyzed data from
four within-subject, sham-controlled tDCS experiments (N = 83). Two AM experiments included 20 minutes of anodal 1.5mA tDCS over the posterior-parietal cortex (PPC) – left hemisphere in Experiment 1; right hemisphere in Experiment 2. WM experiments targeted PPC and dorsolateral prefrontal cortex – left side in Experiment 3; right side in Experiment 4, with 20 minutes of 1.8mA anodal tDCS. The participants completed memory tasks after the stimulation. The order of the sessions was counterbalanced across participants. At the end of the last session, they were asked to try to guess the session in which they received sham stimulation. We found no evidence that sham guessing moderated post-tDCS memory performance in experiments in which tDCS effects were observed as well as in those that showed null effects of tDCS. Specifically, we found no evidence for the interaction between actual stimulation condition and correct sham-guessing across all experiments and outcome measures (p-values range 0.12 – 0.99). Also, correct sham-guessing had no effect on the AM or WM improvement following active stimulation in the joint analysis performed on a single dataset combined from all experiments (F(1,248) = 1.61, p = 0.21, partial eta squared = 0.01, BF10 = 0.31). The results suggest that the placebo-like effect stemming from participants’ beliefs about the stimulation type they received is unlikely to influence the results
in tDCS memory experiments. We discuss the results in light of the growing debate about the relevance and effectiveness of blinding in brain stimulation research.",
journal = "Clinical Neurophysiology",
title = "Correct end-of-study guess does not moderate the effects of tDCS on associative and working memory",
pages = "S3",
volume = "141",
doi = "10.1016/j.clinph.2022.07.010"
}

Stanković, M., Živanović, M., Bjekić, J.,& Filipović, S. R.. (2022). Correct end-of-study guess does not moderate the effects of tDCS on associative and working memory. in Clinical Neurophysiology, 141, S3.
https://doi.org/10.1016/j.clinph.2022.07.010

Stanković M, Živanović M, Bjekić J, Filipović SR. Correct end-of-study guess does not moderate the effects of tDCS on associative and working memory. in Clinical Neurophysiology. 2022;141:S3.
doi:10.1016/j.clinph.2022.07.010 .

Stanković, Marija, Živanović, Marko, Bjekić, Jovana, Filipović, Saša R., "Correct end-of-study guess does not moderate the effects of tDCS on associative and working memory" in Clinical Neurophysiology, 141 (2022):S3,
https://doi.org/10.1016/j.clinph.2022.07.010 . .

TY  - JOUR
AU  - Bjekić, Jovana
AU  - Paunović, Dunja
AU  - Živanović, Marko
AU  - Stanković, Marija
AU  - Griskova-Bulanova, Inga
AU  - Filipović, Saša R.
PY  - 2022
UR  - http://reff.f.bg.ac.rs/handle/123456789/4005
AB  - Non-invasive brain stimulation (NIBS) methods have gained increased interest in research
and therapy of associative memory (AM) and its impairments. However, the one-size-fits-all approach yields inconsistent findings, thus putting forward the need for electroencephalography (EEG)-guided personalized frequency-modulated NIBS protocols to increase the focality and the effectiveness of the interventions. Still, extraction of individual frequency, especially in the theta band, turned out to be a challenging task. Here we present an approach to extracting the individual theta-band frequency (ITF) from EEG signals recorded during the AM task. The method showed a 93% success rate, good reliability, and the full range of variability of the extracted ITFs. This paper provides a rationale behind the adopted approach and critically evaluates it in comparison to the alternative methods that have been reported in the literature. Finally, we discuss how it could be used as an input parameter for personalized frequency-modulated NIBS approaches—transcranial alternating current stimulation (tACS) and transcranial oscillatory current stimulation (otDCS) directed at AM neuromodulation.
PB  - Basel : MDPI
T2  - Journal of Personalized Medicine
T1  - Determining the individual theta frequency for associative memory targeted personalized transcranial brain stimulation
IS  - 9
SP  - 1367
VL  - 12
DO  - 10.3390/jpm12091367
ER  - 

@article{
author = "Bjekić, Jovana and Paunović, Dunja and Živanović, Marko and Stanković, Marija and Griskova-Bulanova, Inga and Filipović, Saša R.",
year = "2022",
abstract = "Non-invasive brain stimulation (NIBS) methods have gained increased interest in research
and therapy of associative memory (AM) and its impairments. However, the one-size-fits-all approach yields inconsistent findings, thus putting forward the need for electroencephalography (EEG)-guided personalized frequency-modulated NIBS protocols to increase the focality and the effectiveness of the interventions. Still, extraction of individual frequency, especially in the theta band, turned out to be a challenging task. Here we present an approach to extracting the individual theta-band frequency (ITF) from EEG signals recorded during the AM task. The method showed a 93% success rate, good reliability, and the full range of variability of the extracted ITFs. This paper provides a rationale behind the adopted approach and critically evaluates it in comparison to the alternative methods that have been reported in the literature. Finally, we discuss how it could be used as an input parameter for personalized frequency-modulated NIBS approaches—transcranial alternating current stimulation (tACS) and transcranial oscillatory current stimulation (otDCS) directed at AM neuromodulation.",
publisher = "Basel : MDPI",
journal = "Journal of Personalized Medicine",
title = "Determining the individual theta frequency for associative memory targeted personalized transcranial brain stimulation",
number = "9",
pages = "1367",
volume = "12",
doi = "10.3390/jpm12091367"
}

Bjekić, J., Paunović, D., Živanović, M., Stanković, M., Griskova-Bulanova, I.,& Filipović, S. R.. (2022). Determining the individual theta frequency for associative memory targeted personalized transcranial brain stimulation. in Journal of Personalized Medicine
Basel : MDPI., 12(9), 1367.
https://doi.org/10.3390/jpm12091367

Bjekić J, Paunović D, Živanović M, Stanković M, Griskova-Bulanova I, Filipović SR. Determining the individual theta frequency for associative memory targeted personalized transcranial brain stimulation. in Journal of Personalized Medicine. 2022;12(9):1367.
doi:10.3390/jpm12091367 .

Bjekić, Jovana, Paunović, Dunja, Živanović, Marko, Stanković, Marija, Griskova-Bulanova, Inga, Filipović, Saša R., "Determining the individual theta frequency for associative memory targeted personalized transcranial brain stimulation" in Journal of Personalized Medicine, 12, no. 9 (2022):1367,
https://doi.org/10.3390/jpm12091367 . .

TY  - JOUR
AU  - Stanković, Marija
AU  - Živanović, Marko
AU  - Bjekić, Jovana
AU  - Filipović, Saša R.
PY  - 2022
UR  - http://reff.f.bg.ac.rs/handle/123456789/3425
AB  - Transcranial direct current stimulation (tDCS) has become a valuable tool in cognitive neuroscience
research as it enables causal inferences about neural underpinnings of cognition. However,
studies using tDCS to modulate cognitive functions often yield inconsistent findings. Hence, there
is an increasing interest in factors that may moderate the effects, one of which is the participants’
beliefs of the tDCS condition (i.e., real or sham) they received. Namely, whether participants’ correct
guessing of sham condition may lead to false-positive tDCS effects. In this study, we aimed to
explore if participants’ beliefs about received stimulation type (i.e., the success of blinding) impacted
their task performance in tDCS experiments on associative (AM) and working memory (WM).We
analyzed data from four within-subject, sham-controlled tDCS memory experiments (N = 83) to
check if the correct end-of-study guess of sham condition moderated tDCS effects. We found no
evidence that sham guessing moderated post-tDCS memory performance in experiments in which
tDCS effects were observed as well as in experiments that showed null effects of tDCS. The results
suggest that the correct sham guessing (i.e., placebo-like effect) is unlikely to influence the results in
tDCS memory experiments. We discuss the results in light of the growing debate about the relevance
and effectiveness of blinding in brain stimulation research.
PB  - Basel : MDPI
T2  - Brain sciences
T1  - Blinding in tDCS Studies: Correct End-of-Study Guess Does Not Moderate the Effects on Associative and Working Memory
IS  - 1
SP  - 58
VL  - 12
DO  - 10.3390/brainsci12010058
ER  - 

@article{
author = "Stanković, Marija and Živanović, Marko and Bjekić, Jovana and Filipović, Saša R.",
year = "2022",
abstract = "Transcranial direct current stimulation (tDCS) has become a valuable tool in cognitive neuroscience
research as it enables causal inferences about neural underpinnings of cognition. However,
studies using tDCS to modulate cognitive functions often yield inconsistent findings. Hence, there
is an increasing interest in factors that may moderate the effects, one of which is the participants’
beliefs of the tDCS condition (i.e., real or sham) they received. Namely, whether participants’ correct
guessing of sham condition may lead to false-positive tDCS effects. In this study, we aimed to
explore if participants’ beliefs about received stimulation type (i.e., the success of blinding) impacted
their task performance in tDCS experiments on associative (AM) and working memory (WM).We
analyzed data from four within-subject, sham-controlled tDCS memory experiments (N = 83) to
check if the correct end-of-study guess of sham condition moderated tDCS effects. We found no
evidence that sham guessing moderated post-tDCS memory performance in experiments in which
tDCS effects were observed as well as in experiments that showed null effects of tDCS. The results
suggest that the correct sham guessing (i.e., placebo-like effect) is unlikely to influence the results in
tDCS memory experiments. We discuss the results in light of the growing debate about the relevance
and effectiveness of blinding in brain stimulation research.",
publisher = "Basel : MDPI",
journal = "Brain sciences",
title = "Blinding in tDCS Studies: Correct End-of-Study Guess Does Not Moderate the Effects on Associative and Working Memory",
number = "1",
pages = "58",
volume = "12",
doi = "10.3390/brainsci12010058"
}

Stanković, M., Živanović, M., Bjekić, J.,& Filipović, S. R.. (2022). Blinding in tDCS Studies: Correct End-of-Study Guess Does Not Moderate the Effects on Associative and Working Memory. in Brain sciences
Basel : MDPI., 12(1), 58.
https://doi.org/10.3390/brainsci12010058

Stanković M, Živanović M, Bjekić J, Filipović SR. Blinding in tDCS Studies: Correct End-of-Study Guess Does Not Moderate the Effects on Associative and Working Memory. in Brain sciences. 2022;12(1):58.
doi:10.3390/brainsci12010058 .

Stanković, Marija, Živanović, Marko, Bjekić, Jovana, Filipović, Saša R., "Blinding in tDCS Studies: Correct End-of-Study Guess Does Not Moderate the Effects on Associative and Working Memory" in Brain sciences, 12, no. 1 (2022):58,
https://doi.org/10.3390/brainsci12010058 . .

TY  - JOUR
AU  - Bjekić, Jovana
AU  - Živanović, Marko
AU  - Paunović, Dunja
AU  - Vulić, Katarina
AU  - Konstantinović, Uroš
AU  - Filipović, Saša R.
PY  - 2022
UR  - http://reff.f.bg.ac.rs/handle/123456789/4004
AB  - Associative memory (AM) is the ability to remember the relationship between previously
unrelated items. AM is significantly affected by normal aging and neurodegenerative conditions,
thus there is a growing interest in applying non-invasive brain stimulation (NIBS) techniques for
AM enhancement. A growing body of studies identifies posterior parietal cortex (PPC) as the most
promising cortical target for both transcranial magnetic stimulation (TMS) and transcranial electrical stimulation (tES) to modulate a cortico-hippocampal network that underlines AM. In that sense, theta frequency oscillatory tES protocols, targeted towards the hallmark oscillatory activity within the cortico-hippocampal network, are increasingly coming to prominence. To increase precision and effectiveness, the need for EEG guided individualization of the tES protocols is proposed. Here, we present the study protocol in which two types of personalized oscillatory tES–transcranial alternating current stimulation (tACS) and oscillatory transcranial direct current stimulation (otDCS), both frequency-modulated to the individual theta-band frequency (ITF), are compared to the nonoscillatory transcranial direct current stimulation (tDCS) and to the sham stimulation. The study has cross-over design with four tES conditions (tACS, otDCS, tDCS, sham), and the comprehensive set of neurophysiological (resting state EEG and AM-evoked EEG) and behavioral outcomes, including AM tasks (short-term associative memory, face–word, face–object, object-location), as well as measures of other cognitive functions (cognitive control, verbal fluency, and working memory).
PB  - Basel : MDPI
T2  - Brain Sciences
T1  - Personalized frequency modulated transcranial electrical stimulation for associative memory enhancement
IS  - 4
SP  - 472
VL  - 12
DO  - 10.3390/brainsci12040472
ER  - 

@article{
author = "Bjekić, Jovana and Živanović, Marko and Paunović, Dunja and Vulić, Katarina and Konstantinović, Uroš and Filipović, Saša R.",
year = "2022",
abstract = "Associative memory (AM) is the ability to remember the relationship between previously
unrelated items. AM is significantly affected by normal aging and neurodegenerative conditions,
thus there is a growing interest in applying non-invasive brain stimulation (NIBS) techniques for
AM enhancement. A growing body of studies identifies posterior parietal cortex (PPC) as the most
promising cortical target for both transcranial magnetic stimulation (TMS) and transcranial electrical stimulation (tES) to modulate a cortico-hippocampal network that underlines AM. In that sense, theta frequency oscillatory tES protocols, targeted towards the hallmark oscillatory activity within the cortico-hippocampal network, are increasingly coming to prominence. To increase precision and effectiveness, the need for EEG guided individualization of the tES protocols is proposed. Here, we present the study protocol in which two types of personalized oscillatory tES–transcranial alternating current stimulation (tACS) and oscillatory transcranial direct current stimulation (otDCS), both frequency-modulated to the individual theta-band frequency (ITF), are compared to the nonoscillatory transcranial direct current stimulation (tDCS) and to the sham stimulation. The study has cross-over design with four tES conditions (tACS, otDCS, tDCS, sham), and the comprehensive set of neurophysiological (resting state EEG and AM-evoked EEG) and behavioral outcomes, including AM tasks (short-term associative memory, face–word, face–object, object-location), as well as measures of other cognitive functions (cognitive control, verbal fluency, and working memory).",
publisher = "Basel : MDPI",
journal = "Brain Sciences",
title = "Personalized frequency modulated transcranial electrical stimulation for associative memory enhancement",
number = "4",
pages = "472",
volume = "12",
doi = "10.3390/brainsci12040472"
}

Bjekić, J., Živanović, M., Paunović, D., Vulić, K., Konstantinović, U.,& Filipović, S. R.. (2022). Personalized frequency modulated transcranial electrical stimulation for associative memory enhancement. in Brain Sciences
Basel : MDPI., 12(4), 472.
https://doi.org/10.3390/brainsci12040472

Bjekić J, Živanović M, Paunović D, Vulić K, Konstantinović U, Filipović SR. Personalized frequency modulated transcranial electrical stimulation for associative memory enhancement. in Brain Sciences. 2022;12(4):472.
doi:10.3390/brainsci12040472 .

Bjekić, Jovana, Živanović, Marko, Paunović, Dunja, Vulić, Katarina, Konstantinović, Uroš, Filipović, Saša R., "Personalized frequency modulated transcranial electrical stimulation for associative memory enhancement" in Brain Sciences, 12, no. 4 (2022):472,
https://doi.org/10.3390/brainsci12040472 . .

TY  - CONF
AU  - Bjekić, Jovana
AU  - Živanović, Marko
AU  - Paunović, Dunja
AU  - Vulić, Katarina
AU  - Konstantinović, Uroš
AU  - Stanković, Marija
AU  - Filipović, Saša R.
PY  - 2022
UR  - http://reff.f.bg.ac.rs/handle/123456789/4875
AB  - Non-invasive brain stimulation (NIBS) has gained increased interest in research of associative memory (AM) and its impairments. However, the one-size-fits-all approach yields inconsistent effects, thus putting forward the need for the development of personalized frequency-modulated NIBS protocols to increase the focality and the effectiveness of the interventions. Specifically, transcranial alternating current stimulation (tACS) and transcranial oscillatory current stimulation (otDCS) with theta-band frequencies (4-8Hz) are promising opportunities for memory neuromodulation. The aim of the current study was (1) to develop a method for extracting the individual theta-band frequency (ITF) to be used as an input parameter for personalized theta modulated tACS and otDCS; (2) to assess the effects of tACS and otDCS in comparison to constant anodal tDCS and sham on different AM measures including short-term AM, delayed recognition, and cued recall. In a sample of 42 healthy volunteers, we extracted the ITF from the EEG signal recorded during successful encoding in an AM task, for each participant. In cross-over counterbalanced design, different stimulation protocols (tACS/otDCS/tDCS/sham) were delivered in separate sessions (7 days apart) for 20 minutes over posterior parietal cortex. The tACS and otDCS were applied using the ITF. Participants completed a series of AM tasks both during and following the stimulation. The study showed mixed results - depending on the outcome measure we observed either better AM performance in relation to tACS, otDCS, and tDCS or no effects of stimulation. We will discuss ITF-extraction challenges and possible methodological and conceptual explanations for the inconsistent effects.
C3  - ICON: International Conference of Cognitive Neuroscience (May 18-22, Helsinki, Finland)
T1  - From brain waves to memory boost: Personalized frequency-modulated transcranial electric stimulation over posterior parietal cortex for associative memory enhancement
SP  - 284
UR  - https://hdl.handle.net/21.15107/rcub_reff_4875
ER  - 

@conference{
author = "Bjekić, Jovana and Živanović, Marko and Paunović, Dunja and Vulić, Katarina and Konstantinović, Uroš and Stanković, Marija and Filipović, Saša R.",
year = "2022",
abstract = "Non-invasive brain stimulation (NIBS) has gained increased interest in research of associative memory (AM) and its impairments. However, the one-size-fits-all approach yields inconsistent effects, thus putting forward the need for the development of personalized frequency-modulated NIBS protocols to increase the focality and the effectiveness of the interventions. Specifically, transcranial alternating current stimulation (tACS) and transcranial oscillatory current stimulation (otDCS) with theta-band frequencies (4-8Hz) are promising opportunities for memory neuromodulation. The aim of the current study was (1) to develop a method for extracting the individual theta-band frequency (ITF) to be used as an input parameter for personalized theta modulated tACS and otDCS; (2) to assess the effects of tACS and otDCS in comparison to constant anodal tDCS and sham on different AM measures including short-term AM, delayed recognition, and cued recall. In a sample of 42 healthy volunteers, we extracted the ITF from the EEG signal recorded during successful encoding in an AM task, for each participant. In cross-over counterbalanced design, different stimulation protocols (tACS/otDCS/tDCS/sham) were delivered in separate sessions (7 days apart) for 20 minutes over posterior parietal cortex. The tACS and otDCS were applied using the ITF. Participants completed a series of AM tasks both during and following the stimulation. The study showed mixed results - depending on the outcome measure we observed either better AM performance in relation to tACS, otDCS, and tDCS or no effects of stimulation. We will discuss ITF-extraction challenges and possible methodological and conceptual explanations for the inconsistent effects.",
journal = "ICON: International Conference of Cognitive Neuroscience (May 18-22, Helsinki, Finland)",
title = "From brain waves to memory boost: Personalized frequency-modulated transcranial electric stimulation over posterior parietal cortex for associative memory enhancement",
pages = "284",
url = "https://hdl.handle.net/21.15107/rcub_reff_4875"
}

Bjekić, J., Živanović, M., Paunović, D., Vulić, K., Konstantinović, U., Stanković, M.,& Filipović, S. R.. (2022). From brain waves to memory boost: Personalized frequency-modulated transcranial electric stimulation over posterior parietal cortex for associative memory enhancement. in ICON: International Conference of Cognitive Neuroscience (May 18-22, Helsinki, Finland), 284.
https://hdl.handle.net/21.15107/rcub_reff_4875

Bjekić J, Živanović M, Paunović D, Vulić K, Konstantinović U, Stanković M, Filipović SR. From brain waves to memory boost: Personalized frequency-modulated transcranial electric stimulation over posterior parietal cortex for associative memory enhancement. in ICON: International Conference of Cognitive Neuroscience (May 18-22, Helsinki, Finland). 2022;:284.
https://hdl.handle.net/21.15107/rcub_reff_4875 .

Bjekić, Jovana, Živanović, Marko, Paunović, Dunja, Vulić, Katarina, Konstantinović, Uroš, Stanković, Marija, Filipović, Saša R., "From brain waves to memory boost: Personalized frequency-modulated transcranial electric stimulation over posterior parietal cortex for associative memory enhancement" in ICON: International Conference of Cognitive Neuroscience (May 18-22, Helsinki, Finland) (2022):284,
https://hdl.handle.net/21.15107/rcub_reff_4875 .

TY  - CONF
AU  - Bjekić, Jovana
AU  - Paunović, Dunja
AU  - Aldoughan, Eman
AU  - Al-Hoorie, Ali H.
AU  - Alrabai, Fakieh
AU  - Biondi, Luiz
AU  - Brázdil, Milan
AU  - Chen, Po Ling
AU  - Coelho, Luis
AU  - Dresler, Martin
AU  - Elsherif, Mahmoud
AU  - Filipović, Saša R.
AU  - Graichen, Luise
AU  - Grave, Joana
AU  - Griškova-Bulanova, Inga
AU  - Gula, Bartosz
AU  - Juras, Luka
AU  - Jurkovičová, Lenka
AU  - Konrad, Boris
AU  - Konstantinović, Uroš
AU  - Koso-Drljević, Maida
AU  - Mazancieux, Audrey
AU  - Mišetić, Katarina
AU  - Podlesek, Anja
AU  - Rapoport, Dikla
AU  - Reich, Lars Matthias
AU  - Ružičková, Alexandra
AU  - Sandberg, Kristian
AU  - Schmidt, Kathleen
AU  - Silva, André
AU  - Solé-Casals, Jordi
AU  - Stanković, Marija
AU  - Svoboda, Vojtěch
AU  - Trujillo-Rodriguez, Diana
AU  - Tsagkaridis, Kostas
AU  - Undorf, Monika
AU  - Wagner, Isabella
AU  - Wang, Grace
AU  - Wierzchon, Michal
AU  - Keat Wong, Hoo
AU  - Vranić, Andrea
AU  - Vulić, Katarina
AU  - Živanović, Marko
AU  - Levy, Daniel A.
PY  - 2022
UR  - http://reff.f.bg.ac.rs/handle/123456789/4876
AB  - Associative memory (AM) is conceptualized as the ability to form links between two previously unrelated pieces of information so that the subsequent presentation of one activates the memory of the other. Unlike other types of memory for which standardized assessment tools exist, AM is assessed mostly by ad hoc tasks designed to tackle specific research questions that are not meant to capture AM as a universal cognitive ability. Typically, AM is assessed using paired-associate paradigms with unimodal (e.g., word pairs) or multimodal (e.g., face-word) stimuli sets. In culturally diverse and multilingual societies, the application of these paradigms can lead to an unreliable and biased assessment of memory abilities. To address this issue, we developed an AM paradigm that combines key aspects of AM assessment – associative encoding, associative recognition, and cued recall, as well as implicit AM effect. The stimuli for the task - pictures of common objects and natural scenes - have been selected to minimize language and culture effects. The task has been developed using free software (OpenSesame) and stimuli, in both online and offline mode of administration, thus enabling wide and free use for research purposes across different settings. The large-scale international collaboration is set to adapt the task into 25 languages so far, including Arabic, Bosnian, Czech, Catalan, Chinese, Croatian, Danish, Dutch, English, Estonian, French, German, Greek, Hebrew, Hungarian, Italian, Lithuanian, Malay, Polish, Portuguese, Romanian, Serbian, Slovak, Slovene, and Spanish. Data is collected across 26 countries with a total of 34 samples (150-300 participants each) to assess the psychometric properties of the task and crosslinguistic (in)variance of the memory performance. The collaboration is expected to result in a comprehensive multilingual AM assessment tool, that is freely available for research use.
C3  - ICON: International Conference of Cognitive Neuroscience (May 18-22, Helsinki, Finland)
T1  - Towards cross-linguistic assessment of associative memory
SP  - 283
UR  - https://hdl.handle.net/21.15107/rcub_reff_4876
ER  - 

@conference{
author = "Bjekić, Jovana and Paunović, Dunja and Aldoughan, Eman and Al-Hoorie, Ali H. and Alrabai, Fakieh and Biondi, Luiz and Brázdil, Milan and Chen, Po Ling and Coelho, Luis and Dresler, Martin and Elsherif, Mahmoud and Filipović, Saša R. and Graichen, Luise and Grave, Joana and Griškova-Bulanova, Inga and Gula, Bartosz and Juras, Luka and Jurkovičová, Lenka and Konrad, Boris and Konstantinović, Uroš and Koso-Drljević, Maida and Mazancieux, Audrey and Mišetić, Katarina and Podlesek, Anja and Rapoport, Dikla and Reich, Lars Matthias and Ružičková, Alexandra and Sandberg, Kristian and Schmidt, Kathleen and Silva, André and Solé-Casals, Jordi and Stanković, Marija and Svoboda, Vojtěch and Trujillo-Rodriguez, Diana and Tsagkaridis, Kostas and Undorf, Monika and Wagner, Isabella and Wang, Grace and Wierzchon, Michal and Keat Wong, Hoo and Vranić, Andrea and Vulić, Katarina and Živanović, Marko and Levy, Daniel A.",
year = "2022",
abstract = "Associative memory (AM) is conceptualized as the ability to form links between two previously unrelated pieces of information so that the subsequent presentation of one activates the memory of the other. Unlike other types of memory for which standardized assessment tools exist, AM is assessed mostly by ad hoc tasks designed to tackle specific research questions that are not meant to capture AM as a universal cognitive ability. Typically, AM is assessed using paired-associate paradigms with unimodal (e.g., word pairs) or multimodal (e.g., face-word) stimuli sets. In culturally diverse and multilingual societies, the application of these paradigms can lead to an unreliable and biased assessment of memory abilities. To address this issue, we developed an AM paradigm that combines key aspects of AM assessment – associative encoding, associative recognition, and cued recall, as well as implicit AM effect. The stimuli for the task - pictures of common objects and natural scenes - have been selected to minimize language and culture effects. The task has been developed using free software (OpenSesame) and stimuli, in both online and offline mode of administration, thus enabling wide and free use for research purposes across different settings. The large-scale international collaboration is set to adapt the task into 25 languages so far, including Arabic, Bosnian, Czech, Catalan, Chinese, Croatian, Danish, Dutch, English, Estonian, French, German, Greek, Hebrew, Hungarian, Italian, Lithuanian, Malay, Polish, Portuguese, Romanian, Serbian, Slovak, Slovene, and Spanish. Data is collected across 26 countries with a total of 34 samples (150-300 participants each) to assess the psychometric properties of the task and crosslinguistic (in)variance of the memory performance. The collaboration is expected to result in a comprehensive multilingual AM assessment tool, that is freely available for research use.",
journal = "ICON: International Conference of Cognitive Neuroscience (May 18-22, Helsinki, Finland)",
title = "Towards cross-linguistic assessment of associative memory",
pages = "283",
url = "https://hdl.handle.net/21.15107/rcub_reff_4876"
}

Bjekić, J., Paunović, D., Aldoughan, E., Al-Hoorie, A. H., Alrabai, F., Biondi, L., Brázdil, M., Chen, P. L., Coelho, L., Dresler, M., Elsherif, M., Filipović, S. R., Graichen, L., Grave, J., Griškova-Bulanova, I., Gula, B., Juras, L., Jurkovičová, L., Konrad, B., Konstantinović, U., Koso-Drljević, M., Mazancieux, A., Mišetić, K., Podlesek, A., Rapoport, D., Reich, L. M., Ružičková, A., Sandberg, K., Schmidt, K., Silva, A., Solé-Casals, J., Stanković, M., Svoboda, V., Trujillo-Rodriguez, D., Tsagkaridis, K., Undorf, M., Wagner, I., Wang, G., Wierzchon, M., Keat Wong, H., Vranić, A., Vulić, K., Živanović, M.,& Levy, D. A.. (2022). Towards cross-linguistic assessment of associative memory. in ICON: International Conference of Cognitive Neuroscience (May 18-22, Helsinki, Finland), 283.
https://hdl.handle.net/21.15107/rcub_reff_4876

Bjekić J, Paunović D, Aldoughan E, Al-Hoorie AH, Alrabai F, Biondi L, Brázdil M, Chen PL, Coelho L, Dresler M, Elsherif M, Filipović SR, Graichen L, Grave J, Griškova-Bulanova I, Gula B, Juras L, Jurkovičová L, Konrad B, Konstantinović U, Koso-Drljević M, Mazancieux A, Mišetić K, Podlesek A, Rapoport D, Reich LM, Ružičková A, Sandberg K, Schmidt K, Silva A, Solé-Casals J, Stanković M, Svoboda V, Trujillo-Rodriguez D, Tsagkaridis K, Undorf M, Wagner I, Wang G, Wierzchon M, Keat Wong H, Vranić A, Vulić K, Živanović M, Levy DA. Towards cross-linguistic assessment of associative memory. in ICON: International Conference of Cognitive Neuroscience (May 18-22, Helsinki, Finland). 2022;:283.
https://hdl.handle.net/21.15107/rcub_reff_4876 .

Bjekić, Jovana, Paunović, Dunja, Aldoughan, Eman, Al-Hoorie, Ali H., Alrabai, Fakieh, Biondi, Luiz, Brázdil, Milan, Chen, Po Ling, Coelho, Luis, Dresler, Martin, Elsherif, Mahmoud, Filipović, Saša R., Graichen, Luise, Grave, Joana, Griškova-Bulanova, Inga, Gula, Bartosz, Juras, Luka, Jurkovičová, Lenka, Konrad, Boris, Konstantinović, Uroš, Koso-Drljević, Maida, Mazancieux, Audrey, Mišetić, Katarina, Podlesek, Anja, Rapoport, Dikla, Reich, Lars Matthias, Ružičková, Alexandra, Sandberg, Kristian, Schmidt, Kathleen, Silva, André, Solé-Casals, Jordi, Stanković, Marija, Svoboda, Vojtěch, Trujillo-Rodriguez, Diana, Tsagkaridis, Kostas, Undorf, Monika, Wagner, Isabella, Wang, Grace, Wierzchon, Michal, Keat Wong, Hoo, Vranić, Andrea, Vulić, Katarina, Živanović, Marko, Levy, Daniel A., "Towards cross-linguistic assessment of associative memory" in ICON: International Conference of Cognitive Neuroscience (May 18-22, Helsinki, Finland) (2022):283,
https://hdl.handle.net/21.15107/rcub_reff_4876 .

TY  - CONF
AU  - Živanović, Marko
AU  - Bjekić, Jovana
AU  - Filipović, Saša R.
PY  - 2022
UR  - http://reff.f.bg.ac.rs/handle/123456789/4874
AB  - Previous studies have found that anodal tDCS of prefrontal and parietal regions has the potential to promote executive functions and other building blocks of higher cognition. However, little is known on whether these effects can be translated to more complex cognitive functions. The present study explored the effects of anodal tDCS over dorsolateral prefrontal cortex (dlPFC) and posterior parietal cortex (PPC) on higher cognitive functions, namely, fluid reasoning (Gf) and crystallized abilities (Gf), visual processing (Gv), and cognitive speed (Gs). Forty-eight right handed volunteers (20-35 years, 50% females) participated in the sham-controlled cross-over experiment with two parallel groups (left and right hemisphere). Participants underwent four experimental sessions (at least two weeks apart) in which they received unilateral tDCS (1.8mA) over dlPFC, PPC, simultaneous stimulation of dlPFC and PPC (0.9mA per loci), or sham. In each session, the reference electrode was placed on the contralateral cheek. The tDCS was applied for 20min (30s ramp-up and ramp-down periods), while in the sham condition, the current was delivered only at the beginning and at the end in a 30s rump up/down fashion. For the assessment of cognitive performance, parallel forms of the tests were used. Each cognitive factor was assessed using two tests half of which were verbal and the other half nonverbal. In comparison to sham, stimulation of the left dlPFC resulted in facilitation of cognitive speed in the verbal domain, while both right dlPFC and PPC tDCS increased visual processing. Interestingly, a domain-specific disruption of nonverbal fluid reasoning was observed following right dlPFC stimulation and the same trend was observed for right PPC stimulation. Finally, simultaneous tDCS of dlPFC and PPC did not induce modulatory effects on any cognitive test. Results indicate that the performance on complex cognitive tasks can be modulated by tDCS but that the effects may vary depending on the stimulation site, laterality as well as cognitive tasks that are used as outcome measures. A possibility that the observed effects are mediated by modulation of lower-level executive processes will be discussed.
C3  - ICON: International Conference of Cognitive Neuroscience (May 18-22, Helsinki, Finland)
T1  - The effects of anodal tDCS of the frontoparietal network on higher cognitive functions
SP  - 185
UR  - https://hdl.handle.net/21.15107/rcub_reff_4874
ER  - 

@conference{
author = "Živanović, Marko and Bjekić, Jovana and Filipović, Saša R.",
year = "2022",
abstract = "Previous studies have found that anodal tDCS of prefrontal and parietal regions has the potential to promote executive functions and other building blocks of higher cognition. However, little is known on whether these effects can be translated to more complex cognitive functions. The present study explored the effects of anodal tDCS over dorsolateral prefrontal cortex (dlPFC) and posterior parietal cortex (PPC) on higher cognitive functions, namely, fluid reasoning (Gf) and crystallized abilities (Gf), visual processing (Gv), and cognitive speed (Gs). Forty-eight right handed volunteers (20-35 years, 50% females) participated in the sham-controlled cross-over experiment with two parallel groups (left and right hemisphere). Participants underwent four experimental sessions (at least two weeks apart) in which they received unilateral tDCS (1.8mA) over dlPFC, PPC, simultaneous stimulation of dlPFC and PPC (0.9mA per loci), or sham. In each session, the reference electrode was placed on the contralateral cheek. The tDCS was applied for 20min (30s ramp-up and ramp-down periods), while in the sham condition, the current was delivered only at the beginning and at the end in a 30s rump up/down fashion. For the assessment of cognitive performance, parallel forms of the tests were used. Each cognitive factor was assessed using two tests half of which were verbal and the other half nonverbal. In comparison to sham, stimulation of the left dlPFC resulted in facilitation of cognitive speed in the verbal domain, while both right dlPFC and PPC tDCS increased visual processing. Interestingly, a domain-specific disruption of nonverbal fluid reasoning was observed following right dlPFC stimulation and the same trend was observed for right PPC stimulation. Finally, simultaneous tDCS of dlPFC and PPC did not induce modulatory effects on any cognitive test. Results indicate that the performance on complex cognitive tasks can be modulated by tDCS but that the effects may vary depending on the stimulation site, laterality as well as cognitive tasks that are used as outcome measures. A possibility that the observed effects are mediated by modulation of lower-level executive processes will be discussed.",
journal = "ICON: International Conference of Cognitive Neuroscience (May 18-22, Helsinki, Finland)",
title = "The effects of anodal tDCS of the frontoparietal network on higher cognitive functions",
pages = "185",
url = "https://hdl.handle.net/21.15107/rcub_reff_4874"
}

Živanović, M., Bjekić, J.,& Filipović, S. R.. (2022). The effects of anodal tDCS of the frontoparietal network on higher cognitive functions. in ICON: International Conference of Cognitive Neuroscience (May 18-22, Helsinki, Finland), 185.
https://hdl.handle.net/21.15107/rcub_reff_4874

Živanović M, Bjekić J, Filipović SR. The effects of anodal tDCS of the frontoparietal network on higher cognitive functions. in ICON: International Conference of Cognitive Neuroscience (May 18-22, Helsinki, Finland). 2022;:185.
https://hdl.handle.net/21.15107/rcub_reff_4874 .

Živanović, Marko, Bjekić, Jovana, Filipović, Saša R., "The effects of anodal tDCS of the frontoparietal network on higher cognitive functions" in ICON: International Conference of Cognitive Neuroscience (May 18-22, Helsinki, Finland) (2022):185,
https://hdl.handle.net/21.15107/rcub_reff_4874 .

TY  - CONF
AU  - Živanović, Marko
AU  - Bjekić, Jovana
AU  - Konstantinović, Uroš
AU  - Filipović, Saša R.
PY  - 2022
UR  - http://reff.f.bg.ac.rs/handle/123456789/4871
AB  - Different transcranial electric stimulation (tES) techniques showed promise for noninvasive neuromodulation of memory functions. However, previous studies yielded inconsistent effects, while only a few studies directly compared the effects of different types of stimulation. Thus, here we aim to directly contrast three types of tES in the enhancement of short-term associative memory (STAM), namely, constant anodal transcranial direct current stimulation (tDCS), oscillatory transcranial current stimulation (otDCS), and transcranial alternating current stimulation (tACS). Forty healthy right-handed volunteers (25 females, M = 25.15 ± 3.66 years) participated in the cross-over sham-controlled experiment. Participants underwent four experimental sessions in counterbalanced order (at least 7 days apart) in which they received: tDCS (1.5mA), otDCS at individual theta frequency (ITF, 4-8Hz) (1.5mA ± 0.5mA), tACS at ITF (0±1mA), or sham over the left posterior parietal cortex (P3, 10-20 International EEG system). The current was applied for 20min with 30s ramp-up and ramp-down periods. In the sham condition, the current was applied only at the beginning and at the end in a 30s rump up/down fashion. STAM was assessed during the stimulation, 3-4 minutes after the onset of the protocol. The STAM task was designed in four parallel forms and consisted of digit-color association sequences in which single-digits (0-9) were presented sequentially on the cards of different colors. Participants were instructed to try to remember each digit-color association. The sequence length varied between 3 (low-demand) to 5 stimuli (high-demand) and the sequences were presented in pre-randomized order. At the end of each sequence, the participants were presented with a cue i.e., one of the previously seen color cards and they needed to recall the digit that was presented on a given card. Results showed that relative to sham tDCS improved STAM in low- [F(1,39) = 7.39, p = .010, ηp2 = .16] as well as high demand sequences [F(1,39) = 4.71, p = .036, ηp2 = .11], while otDCS [F(1,39) = 4.79, p = .035, ηp2 = .11] and tACS [F(1,39) = 4.42, p = .042, ηp2 = .10] exclusively improved performance for high-demand sequences. The results indicate that different stimulation protocols potentially facilitate different cognitive processes. Namely, the effects of constant tDCS on STAM appear to be mediated by boosting the lower-level attention processes while the oscillatory protocols seem to directly promote associative binding.
PB  - Institut za psihologiju i Laboratorija za eksperimentalnu psihologiju Filozofski fakultet Univerziteta u Beogradu
C3  - XXVIII Empirical studies in psychology - Book of abstracts
T1  - Effects of constant anodal tDCS, oscillatory tDCS, and tACS on short-term associative memory
EP  - 53
SP  - 52
UR  - https://hdl.handle.net/21.15107/rcub_reff_4871
ER  - 

@conference{
author = "Živanović, Marko and Bjekić, Jovana and Konstantinović, Uroš and Filipović, Saša R.",
year = "2022",
abstract = "Different transcranial electric stimulation (tES) techniques showed promise for noninvasive neuromodulation of memory functions. However, previous studies yielded inconsistent effects, while only a few studies directly compared the effects of different types of stimulation. Thus, here we aim to directly contrast three types of tES in the enhancement of short-term associative memory (STAM), namely, constant anodal transcranial direct current stimulation (tDCS), oscillatory transcranial current stimulation (otDCS), and transcranial alternating current stimulation (tACS). Forty healthy right-handed volunteers (25 females, M = 25.15 ± 3.66 years) participated in the cross-over sham-controlled experiment. Participants underwent four experimental sessions in counterbalanced order (at least 7 days apart) in which they received: tDCS (1.5mA), otDCS at individual theta frequency (ITF, 4-8Hz) (1.5mA ± 0.5mA), tACS at ITF (0±1mA), or sham over the left posterior parietal cortex (P3, 10-20 International EEG system). The current was applied for 20min with 30s ramp-up and ramp-down periods. In the sham condition, the current was applied only at the beginning and at the end in a 30s rump up/down fashion. STAM was assessed during the stimulation, 3-4 minutes after the onset of the protocol. The STAM task was designed in four parallel forms and consisted of digit-color association sequences in which single-digits (0-9) were presented sequentially on the cards of different colors. Participants were instructed to try to remember each digit-color association. The sequence length varied between 3 (low-demand) to 5 stimuli (high-demand) and the sequences were presented in pre-randomized order. At the end of each sequence, the participants were presented with a cue i.e., one of the previously seen color cards and they needed to recall the digit that was presented on a given card. Results showed that relative to sham tDCS improved STAM in low- [F(1,39) = 7.39, p = .010, ηp2 = .16] as well as high demand sequences [F(1,39) = 4.71, p = .036, ηp2 = .11], while otDCS [F(1,39) = 4.79, p = .035, ηp2 = .11] and tACS [F(1,39) = 4.42, p = .042, ηp2 = .10] exclusively improved performance for high-demand sequences. The results indicate that different stimulation protocols potentially facilitate different cognitive processes. Namely, the effects of constant tDCS on STAM appear to be mediated by boosting the lower-level attention processes while the oscillatory protocols seem to directly promote associative binding.",
publisher = "Institut za psihologiju i Laboratorija za eksperimentalnu psihologiju Filozofski fakultet Univerziteta u Beogradu",
journal = "XXVIII Empirical studies in psychology - Book of abstracts",
title = "Effects of constant anodal tDCS, oscillatory tDCS, and tACS on short-term associative memory",
pages = "53-52",
url = "https://hdl.handle.net/21.15107/rcub_reff_4871"
}

Živanović, M., Bjekić, J., Konstantinović, U.,& Filipović, S. R.. (2022). Effects of constant anodal tDCS, oscillatory tDCS, and tACS on short-term associative memory. in XXVIII Empirical studies in psychology - Book of abstracts
Institut za psihologiju i Laboratorija za eksperimentalnu psihologiju Filozofski fakultet Univerziteta u Beogradu., 52-53.
https://hdl.handle.net/21.15107/rcub_reff_4871

Živanović M, Bjekić J, Konstantinović U, Filipović SR. Effects of constant anodal tDCS, oscillatory tDCS, and tACS on short-term associative memory. in XXVIII Empirical studies in psychology - Book of abstracts. 2022;:52-53.
https://hdl.handle.net/21.15107/rcub_reff_4871 .

Živanović, Marko, Bjekić, Jovana, Konstantinović, Uroš, Filipović, Saša R., "Effects of constant anodal tDCS, oscillatory tDCS, and tACS on short-term associative memory" in XXVIII Empirical studies in psychology - Book of abstracts (2022):52-53,
https://hdl.handle.net/21.15107/rcub_reff_4871 .

TY  - CONF
AU  - Bjekić, Jovana
AU  - Paunović, Dunja
AU  - Živanović, Marko
AU  - Griškova-Bulanova, Inga
AU  - Filipović, Saša R.
PY  - 2022
UR  - http://reff.f.bg.ac.rs/handle/123456789/4884
AB  - Non-invasive brain stimulation (NIBS) has gained increased interest in research and therapy of associative memory (AM) and its impairments. However, the one-size-fits-all approach yields inconsistent findings, thus putting forward the need for the development of personalized frequency modulated NIBS protocols to increase the focality and the effectiveness of the interventions. Here we present the new method for extracting the individual theta-band frequency (ITF) to be used as an input parameter for personalized frequency-modulated NIBS approaches – transcranial altering current stimulation (tACS) and transcranial oscillatory current stimulation (otDCS). In a sample of 42 healthy volunteers, we extracted the frequencies with the highest event-related spectral perturbation from 19 overlapping time windows and six centroparietal electrodes from the EEG signal recorded during successful encoding in an AM task. The ITF was defined as modal frequency (4-8Hz in 0.5 Hz steps) in time x electrode matrix. The method showed 93% success rate, good reliability, and the full range of variability of the extracted ITFs. We present and discuss individual differences in theta-band activity during AM encoding, together with ITF-extraction challenges. Finally, we provide a rationale behind the adopted analytic approach and critically evaluate it in comparison to the alternative methods that have been reported in the literature.
C3  - Cognitive Neuroscience Society CNS - Annual meeting (23-26 April, San Francisco, USA)
T1  - Extracting the individual theta frequency from associative memory EEG for personalized brain stimulation
UR  - https://hdl.handle.net/21.15107/rcub_reff_4884
ER  - 

@conference{
author = "Bjekić, Jovana and Paunović, Dunja and Živanović, Marko and Griškova-Bulanova, Inga and Filipović, Saša R.",
year = "2022",
abstract = "Non-invasive brain stimulation (NIBS) has gained increased interest in research and therapy of associative memory (AM) and its impairments. However, the one-size-fits-all approach yields inconsistent findings, thus putting forward the need for the development of personalized frequency modulated NIBS protocols to increase the focality and the effectiveness of the interventions. Here we present the new method for extracting the individual theta-band frequency (ITF) to be used as an input parameter for personalized frequency-modulated NIBS approaches – transcranial altering current stimulation (tACS) and transcranial oscillatory current stimulation (otDCS). In a sample of 42 healthy volunteers, we extracted the frequencies with the highest event-related spectral perturbation from 19 overlapping time windows and six centroparietal electrodes from the EEG signal recorded during successful encoding in an AM task. The ITF was defined as modal frequency (4-8Hz in 0.5 Hz steps) in time x electrode matrix. The method showed 93% success rate, good reliability, and the full range of variability of the extracted ITFs. We present and discuss individual differences in theta-band activity during AM encoding, together with ITF-extraction challenges. Finally, we provide a rationale behind the adopted analytic approach and critically evaluate it in comparison to the alternative methods that have been reported in the literature.",
journal = "Cognitive Neuroscience Society CNS - Annual meeting (23-26 April, San Francisco, USA)",
title = "Extracting the individual theta frequency from associative memory EEG for personalized brain stimulation",
url = "https://hdl.handle.net/21.15107/rcub_reff_4884"
}

Bjekić, J., Paunović, D., Živanović, M., Griškova-Bulanova, I.,& Filipović, S. R.. (2022). Extracting the individual theta frequency from associative memory EEG for personalized brain stimulation. in Cognitive Neuroscience Society CNS - Annual meeting (23-26 April, San Francisco, USA).
https://hdl.handle.net/21.15107/rcub_reff_4884

Bjekić J, Paunović D, Živanović M, Griškova-Bulanova I, Filipović SR. Extracting the individual theta frequency from associative memory EEG for personalized brain stimulation. in Cognitive Neuroscience Society CNS - Annual meeting (23-26 April, San Francisco, USA). 2022;.
https://hdl.handle.net/21.15107/rcub_reff_4884 .

Bjekić, Jovana, Paunović, Dunja, Živanović, Marko, Griškova-Bulanova, Inga, Filipović, Saša R., "Extracting the individual theta frequency from associative memory EEG for personalized brain stimulation" in Cognitive Neuroscience Society CNS - Annual meeting (23-26 April, San Francisco, USA) (2022),
https://hdl.handle.net/21.15107/rcub_reff_4884 .

TY  - CONF
AU  - Živanović, Marko
AU  - Bjekić, Jovana
AU  - Filipović, Saša R.
PY  - 2022
UR  - http://reff.f.bg.ac.rs/handle/123456789/4883
AB  - Transcranial electric stimulation (tES) techniques are promising tools for neuromodulation of memory functions. However, previous findings on effectiveness of tES are inconsistent and there have been very few studies directly contrasting different types of stimulation. Here we comparatively assess the effectiveness of constant anodal tDCS (1.5mA), oscillatory tDCS (otDCS, 1.5mA ± 0.5mA) at individual theta frequency (ITF)(4-8Hz) and tACS at ITF (0±1mA) over left posterior parietal cortex for the enhancement of short-term associative memory (STAM). In the sham-controlled cross-over experiment participants (N=40) underwent four conditions (tDCS/otDCS/tACS/sham) in counterbalanced order while they performed parallel forms of the STAM task. The STAM task consisted of digit-color association sequences in which single-digits (0 9) were presented sequentially on the colored cards (green/blue/yellow/red/pink/gray) and participants were instructed to remember digit-color associations. The sequence length varied between 3 (low-demand) to 5 stimuli (high-demand). At the end of each sequence, the participants were presented with one of the previously seen colored cards and they needed to recall the digit that was presented on a given card. Planed contrasts have shown that relative to sham, tDCS improved STAM in both low- [F(1,39)=7.39, p=.010, ηp2=.16] and high-demand sequences [F(1,39)=4.71, p=.036, ηp2=.11], while tACS [F(1,39)=4.42, p=.042, ηp2=.10] and otDCS [F(1,39)=4.79, p=.035, ηp2=.11] exclusively improved memory performance in high-demand sequences. The results suggest that different stimulation protocols affect different processes – namely, tDCS effects seem to be mediated by facilitation of lower-level attentional processes while the effects of oscillatory protocols tend to affect memory processes in a more focal manner.
C3  - Cognitive Neuroscience Society CNS - Annual meeting (23-26 April, San Francisco, USA)
T1  - Neuromodulation of short-term associative memory: A comparison between constant anodal tDCS, oscillatory tDCS, and tACS
UR  - https://hdl.handle.net/21.15107/rcub_reff_4883
ER  - 

@conference{
author = "Živanović, Marko and Bjekić, Jovana and Filipović, Saša R.",
year = "2022",
abstract = "Transcranial electric stimulation (tES) techniques are promising tools for neuromodulation of memory functions. However, previous findings on effectiveness of tES are inconsistent and there have been very few studies directly contrasting different types of stimulation. Here we comparatively assess the effectiveness of constant anodal tDCS (1.5mA), oscillatory tDCS (otDCS, 1.5mA ± 0.5mA) at individual theta frequency (ITF)(4-8Hz) and tACS at ITF (0±1mA) over left posterior parietal cortex for the enhancement of short-term associative memory (STAM). In the sham-controlled cross-over experiment participants (N=40) underwent four conditions (tDCS/otDCS/tACS/sham) in counterbalanced order while they performed parallel forms of the STAM task. The STAM task consisted of digit-color association sequences in which single-digits (0 9) were presented sequentially on the colored cards (green/blue/yellow/red/pink/gray) and participants were instructed to remember digit-color associations. The sequence length varied between 3 (low-demand) to 5 stimuli (high-demand). At the end of each sequence, the participants were presented with one of the previously seen colored cards and they needed to recall the digit that was presented on a given card. Planed contrasts have shown that relative to sham, tDCS improved STAM in both low- [F(1,39)=7.39, p=.010, ηp2=.16] and high-demand sequences [F(1,39)=4.71, p=.036, ηp2=.11], while tACS [F(1,39)=4.42, p=.042, ηp2=.10] and otDCS [F(1,39)=4.79, p=.035, ηp2=.11] exclusively improved memory performance in high-demand sequences. The results suggest that different stimulation protocols affect different processes – namely, tDCS effects seem to be mediated by facilitation of lower-level attentional processes while the effects of oscillatory protocols tend to affect memory processes in a more focal manner.",
journal = "Cognitive Neuroscience Society CNS - Annual meeting (23-26 April, San Francisco, USA)",
title = "Neuromodulation of short-term associative memory: A comparison between constant anodal tDCS, oscillatory tDCS, and tACS",
url = "https://hdl.handle.net/21.15107/rcub_reff_4883"
}

Živanović, M., Bjekić, J.,& Filipović, S. R.. (2022). Neuromodulation of short-term associative memory: A comparison between constant anodal tDCS, oscillatory tDCS, and tACS. in Cognitive Neuroscience Society CNS - Annual meeting (23-26 April, San Francisco, USA).
https://hdl.handle.net/21.15107/rcub_reff_4883

Živanović M, Bjekić J, Filipović SR. Neuromodulation of short-term associative memory: A comparison between constant anodal tDCS, oscillatory tDCS, and tACS. in Cognitive Neuroscience Society CNS - Annual meeting (23-26 April, San Francisco, USA). 2022;.
https://hdl.handle.net/21.15107/rcub_reff_4883 .

Živanović, Marko, Bjekić, Jovana, Filipović, Saša R., "Neuromodulation of short-term associative memory: A comparison between constant anodal tDCS, oscillatory tDCS, and tACS" in Cognitive Neuroscience Society CNS - Annual meeting (23-26 April, San Francisco, USA) (2022),
https://hdl.handle.net/21.15107/rcub_reff_4883 .

TY  - CONF
AU  - Bjekić, Jovana
AU  - Paunović, Dunja
AU  - Živanović, Marko
AU  - Griškova-Bulanova, Inga
AU  - Filipović, Saša R.
PY  - 2022
UR  - http://reff.f.bg.ac.rs/handle/123456789/4882
AB  - Individual differences in brain electrophysiologic activity have been recognized a long time ago. Electroencephalographic (EEG) indices such as individual alpha (IAF) and gamma (IGF) frequency have been extensively investigated as biomarkers of individual differences in baseline neurophysiological activity and in response to different stimuli.  In contrast, individual differences in dominant theta frequency have received considerably less attention. Given that theta-band EEG activity underlies memory processes, better knowledge of its individual difference, besides improving understanding of the physiology of memory processes, is of foremost importance for personalization of future non-invasive neuromodulation treatment attempts for memory impairments (such as in dementia and other neurodegenerative disorders). The aim of this study was to explore individual differences in individual theta-band frequency (ITF) from a scalp EEG recorded during associative memory (AM) encoding. In a sample of 42 healthy young adults (age 20 – 35; 50% female) we extracted the frequencies (2-10 Hz, in 0.5 Hz steps) with the highest event-related spectral perturbation from 19 overlapping time windows and six centroparietal electrodes from the EEG recorded during successful encoding in the AM task. The ITF was defined as modal frequency (in the 4-8Hz range) in the given time x electrode matrix. The method showed 93% success rate and the range of variability of the extracted ITFs. We present and discuss individual differences in theta-band activity during AM encoding, together with ITF-extraction challenges.
C3  - FENS Forum (9-13. July, Paris, France)
T1  - Individual differences in dominant theta-band frequency during associative memory encoding
UR  - https://hdl.handle.net/21.15107/rcub_reff_4882
ER  - 

@conference{
author = "Bjekić, Jovana and Paunović, Dunja and Živanović, Marko and Griškova-Bulanova, Inga and Filipović, Saša R.",
year = "2022",
abstract = "Individual differences in brain electrophysiologic activity have been recognized a long time ago. Electroencephalographic (EEG) indices such as individual alpha (IAF) and gamma (IGF) frequency have been extensively investigated as biomarkers of individual differences in baseline neurophysiological activity and in response to different stimuli.  In contrast, individual differences in dominant theta frequency have received considerably less attention. Given that theta-band EEG activity underlies memory processes, better knowledge of its individual difference, besides improving understanding of the physiology of memory processes, is of foremost importance for personalization of future non-invasive neuromodulation treatment attempts for memory impairments (such as in dementia and other neurodegenerative disorders). The aim of this study was to explore individual differences in individual theta-band frequency (ITF) from a scalp EEG recorded during associative memory (AM) encoding. In a sample of 42 healthy young adults (age 20 – 35; 50% female) we extracted the frequencies (2-10 Hz, in 0.5 Hz steps) with the highest event-related spectral perturbation from 19 overlapping time windows and six centroparietal electrodes from the EEG recorded during successful encoding in the AM task. The ITF was defined as modal frequency (in the 4-8Hz range) in the given time x electrode matrix. The method showed 93% success rate and the range of variability of the extracted ITFs. We present and discuss individual differences in theta-band activity during AM encoding, together with ITF-extraction challenges.",
journal = "FENS Forum (9-13. July, Paris, France)",
title = "Individual differences in dominant theta-band frequency during associative memory encoding",
url = "https://hdl.handle.net/21.15107/rcub_reff_4882"
}

Bjekić, J., Paunović, D., Živanović, M., Griškova-Bulanova, I.,& Filipović, S. R.. (2022). Individual differences in dominant theta-band frequency during associative memory encoding. in FENS Forum (9-13. July, Paris, France).
https://hdl.handle.net/21.15107/rcub_reff_4882

Bjekić J, Paunović D, Živanović M, Griškova-Bulanova I, Filipović SR. Individual differences in dominant theta-band frequency during associative memory encoding. in FENS Forum (9-13. July, Paris, France). 2022;.
https://hdl.handle.net/21.15107/rcub_reff_4882 .

Bjekić, Jovana, Paunović, Dunja, Živanović, Marko, Griškova-Bulanova, Inga, Filipović, Saša R., "Individual differences in dominant theta-band frequency during associative memory encoding" in FENS Forum (9-13. July, Paris, France) (2022),
https://hdl.handle.net/21.15107/rcub_reff_4882 .

TY  - CONF
AU  - Paunović, Dunja
AU  - Bjekić, Jovana
AU  - Vulić, Katarina
AU  - Živanović, Marko
AU  - Konstantinović, Uroš
AU  - Stanković, Marija
AU  - Filipović, Saša R.
PY  - 2022
UR  - http://reff.f.bg.ac.rs/handle/123456789/4881
AB  - Associative memory (AM) represents an ability to bind unrelated information into meaningful units and encode them as distinct memories.  AM has been the function of interest in many non-invasive transcranial electrical stimulation (tES) studies aiming to maximize the potential for memory modulation by varying stimulation loci, frequency, and amplitude. In the current study, we aimed to capture modulation potential of AM performance when tailoring the stimulation protocols to the individual brain rhythms. By matching the stimulation frequency to the frequency of each subject’s AM task induced electrophysiological activity in theta spectrum (4-8 Hz), we developed two types of personalized oscillatory protocols: otDCS and tACS, which we administered alongside the constant tDCS and a sham condition in the single-blind cross-over experiment. To comparatively assess the effects of different tES protocols delivered over the posterior parietal cortex, we tested the recognition and recall ability of the 42 healthy young adults on paired-associate paradigms after each of four conditions. Conditions were administered week-apart in a counterbalanced order. Group level comparisons of each active tES condition against sham did not show differences in AM performance either on recognition or cued-recall. However, data showed variability in performance depending on the task and the outcome measures, which calls for stratified approach in order to test robustness of observed findings. Apart from introducing a novel approach to probing AM with personalized tES, this well-powered, multi-protocol, multi-task and multi-measure study produced a comprehensive dataset that allows exploration of factors that could uncover different patterns in responsiveness to tES.
C3  - FENS Forum (9-13. July, Paris, France)
T1  - Personalized transcranial electrical stimulation (tES) for modulation of associative memory performance
UR  - https://hdl.handle.net/21.15107/rcub_reff_4881
ER  - 

@conference{
author = "Paunović, Dunja and Bjekić, Jovana and Vulić, Katarina and Živanović, Marko and Konstantinović, Uroš and Stanković, Marija and Filipović, Saša R.",
year = "2022",
abstract = "Associative memory (AM) represents an ability to bind unrelated information into meaningful units and encode them as distinct memories.  AM has been the function of interest in many non-invasive transcranial electrical stimulation (tES) studies aiming to maximize the potential for memory modulation by varying stimulation loci, frequency, and amplitude. In the current study, we aimed to capture modulation potential of AM performance when tailoring the stimulation protocols to the individual brain rhythms. By matching the stimulation frequency to the frequency of each subject’s AM task induced electrophysiological activity in theta spectrum (4-8 Hz), we developed two types of personalized oscillatory protocols: otDCS and tACS, which we administered alongside the constant tDCS and a sham condition in the single-blind cross-over experiment. To comparatively assess the effects of different tES protocols delivered over the posterior parietal cortex, we tested the recognition and recall ability of the 42 healthy young adults on paired-associate paradigms after each of four conditions. Conditions were administered week-apart in a counterbalanced order. Group level comparisons of each active tES condition against sham did not show differences in AM performance either on recognition or cued-recall. However, data showed variability in performance depending on the task and the outcome measures, which calls for stratified approach in order to test robustness of observed findings. Apart from introducing a novel approach to probing AM with personalized tES, this well-powered, multi-protocol, multi-task and multi-measure study produced a comprehensive dataset that allows exploration of factors that could uncover different patterns in responsiveness to tES.",
journal = "FENS Forum (9-13. July, Paris, France)",
title = "Personalized transcranial electrical stimulation (tES) for modulation of associative memory performance",
url = "https://hdl.handle.net/21.15107/rcub_reff_4881"
}

Paunović, D., Bjekić, J., Vulić, K., Živanović, M., Konstantinović, U., Stanković, M.,& Filipović, S. R.. (2022). Personalized transcranial electrical stimulation (tES) for modulation of associative memory performance. in FENS Forum (9-13. July, Paris, France).
https://hdl.handle.net/21.15107/rcub_reff_4881

Paunović D, Bjekić J, Vulić K, Živanović M, Konstantinović U, Stanković M, Filipović SR. Personalized transcranial electrical stimulation (tES) for modulation of associative memory performance. in FENS Forum (9-13. July, Paris, France). 2022;.
https://hdl.handle.net/21.15107/rcub_reff_4881 .

Paunović, Dunja, Bjekić, Jovana, Vulić, Katarina, Živanović, Marko, Konstantinović, Uroš, Stanković, Marija, Filipović, Saša R., "Personalized transcranial electrical stimulation (tES) for modulation of associative memory performance" in FENS Forum (9-13. July, Paris, France) (2022),
https://hdl.handle.net/21.15107/rcub_reff_4881 .

TY  - CONF
AU  - Stanković, Marija
AU  - Živanović, Marko
AU  - Konstantinović, Uroš
AU  - Paunović, Dunja
AU  - Vulić, Katarina
AU  - Bjekić, Jovana
AU  - Filipović, Saša R.
PY  - 2022
UR  - http://reff.f.bg.ac.rs/handle/123456789/4880
AB  - Transcranial electrical stimulation (tES) is widely used in neuromodulation research. Numerous studies show that the conventional type of tES – transcranial direct current stimulation (tDCS) is a safe and well-tolerated technique. An increasingly popular line of research focuses on implementing alternative tES protocols aimed at the entrainment of brain oscillations. Thus, there is a need for a detailed assessment of the side effects profile and blinding efficacy of such protocols. Here we evaluate the tolerability and blinding efficacy of two personalized oscillatory tES protocols: Transcranial alternating current stimulation (tACS) and oscillatory tDCS (otDCS), applied at individual theta frequency for each participant (4-8Hz). Forty-two young, healthy individuals took part in a within-subject experiment in which they went through four stimulation conditions in a counterbalanced order: TACS (2mA peak-to-peak), otDCS (1.5mA±0.5mA), constant tDCS (1.5mA), and sham. The participants rated discomfort level at four timepoints during the 20-minute stimulation. Before and after each stimulation condition, they completed the standardized side effects questionnaire. The successfulness of blinding was assessed with the end-of-study guess of the sham condition. Overall, the reported discomfort level was low and comparable across all stimulation conditions, with otDCS being slightly more unpleasant than sham. Mild tingling and itching sensations were the most common side effects. No serious side effects were detected. Participant blinding was successful, and sham-guessing was not related to the reported discomfort in any of the stimulation conditions. The data has shown that personalized theta otDCS and tACS are well-tolerated and safe, with adequate blinding success.
C3  - FENS Forum (9-13. July, Paris, France)
T1  - Tolerability and blinding efficacy of personalized theta-modulated transcranial electrical current stimulation
UR  - https://hdl.handle.net/21.15107/rcub_reff_4880
ER  - 

@conference{
author = "Stanković, Marija and Živanović, Marko and Konstantinović, Uroš and Paunović, Dunja and Vulić, Katarina and Bjekić, Jovana and Filipović, Saša R.",
year = "2022",
abstract = "Transcranial electrical stimulation (tES) is widely used in neuromodulation research. Numerous studies show that the conventional type of tES – transcranial direct current stimulation (tDCS) is a safe and well-tolerated technique. An increasingly popular line of research focuses on implementing alternative tES protocols aimed at the entrainment of brain oscillations. Thus, there is a need for a detailed assessment of the side effects profile and blinding efficacy of such protocols. Here we evaluate the tolerability and blinding efficacy of two personalized oscillatory tES protocols: Transcranial alternating current stimulation (tACS) and oscillatory tDCS (otDCS), applied at individual theta frequency for each participant (4-8Hz). Forty-two young, healthy individuals took part in a within-subject experiment in which they went through four stimulation conditions in a counterbalanced order: TACS (2mA peak-to-peak), otDCS (1.5mA±0.5mA), constant tDCS (1.5mA), and sham. The participants rated discomfort level at four timepoints during the 20-minute stimulation. Before and after each stimulation condition, they completed the standardized side effects questionnaire. The successfulness of blinding was assessed with the end-of-study guess of the sham condition. Overall, the reported discomfort level was low and comparable across all stimulation conditions, with otDCS being slightly more unpleasant than sham. Mild tingling and itching sensations were the most common side effects. No serious side effects were detected. Participant blinding was successful, and sham-guessing was not related to the reported discomfort in any of the stimulation conditions. The data has shown that personalized theta otDCS and tACS are well-tolerated and safe, with adequate blinding success.",
journal = "FENS Forum (9-13. July, Paris, France)",
title = "Tolerability and blinding efficacy of personalized theta-modulated transcranial electrical current stimulation",
url = "https://hdl.handle.net/21.15107/rcub_reff_4880"
}

Stanković, M., Živanović, M., Konstantinović, U., Paunović, D., Vulić, K., Bjekić, J.,& Filipović, S. R.. (2022). Tolerability and blinding efficacy of personalized theta-modulated transcranial electrical current stimulation. in FENS Forum (9-13. July, Paris, France).
https://hdl.handle.net/21.15107/rcub_reff_4880

Stanković M, Živanović M, Konstantinović U, Paunović D, Vulić K, Bjekić J, Filipović SR. Tolerability and blinding efficacy of personalized theta-modulated transcranial electrical current stimulation. in FENS Forum (9-13. July, Paris, France). 2022;.
https://hdl.handle.net/21.15107/rcub_reff_4880 .

Stanković, Marija, Živanović, Marko, Konstantinović, Uroš, Paunović, Dunja, Vulić, Katarina, Bjekić, Jovana, Filipović, Saša R., "Tolerability and blinding efficacy of personalized theta-modulated transcranial electrical current stimulation" in FENS Forum (9-13. July, Paris, France) (2022),
https://hdl.handle.net/21.15107/rcub_reff_4880 .

TY  - CONF
AU  - Živanović, Marko
AU  - Bjekić, Jovana
AU  - Konstantinović, Uroš
AU  - Filipović, Saša R.
PY  - 2022
UR  - http://reff.f.bg.ac.rs/handle/123456789/4857
AB  - Transcranial electric stimulation (tES) techniques are promising tools for neuromodulation of memory functions. However, previous findings on their effectiveness are inconsistent, and there have been only a few studies directly contrasting different types of stimulation and examining their differential effects on memory performance. The study objective was the comparative assessment of the online effects of three types of tES over the left posterior parietal cortex (PPC) on the enhancement of short-term associative memory. The three tES types were constant anodal
tDCS (1.5mA), and two types of personalized theta frequency (4-8Hz) oscillatory stimulation protocols - oscillatory tDCS (otDCS, 1.5mA ± 0.5mA) and tACS (0 ± 1mA). Participants (N = 40) took part in the sham-controlled cross-over experiment where they performed parallel forms of the short-term associative memory task while receiving different stimulation types in four counterbalanced experimental sessions (tDCS, otDCS, tACS, and sham). The stimuli within the
short-term associative memory task consisted of digit-color association sequences in which single-digits (0-9) were presented sequentially on the cards of different colors. Participants were instructed to try to remember the digit-color associations presented in each sequence. The length of sequences varied between three (low-demand) to five stimuli (high-demand). At the end of each sequence, the participants were presented with one of the previously seen colored cards, and they needed to recall the digit that was presented on a given card. Planned contrasts within repeated-measures ANOVA showed that relative to sham constant anodal tDCS improved short-term associative memory for both low- and high-demand sequences, while two oscillatory protocols improved memory performance in high-demand sequences only. The results indicate that different stimulation protocols potentially affect different cognitive processes. Namely, the effects of constant anodal tDCS on cognitive performance seem to be mediated by the facilitation of low-level attention processes, while the effects of both otDCS and tACS appear to affect processes that are more central to the associative binding.
C3  - Clinical Neurophysiology
T1  - Transcranial electric stimulation over posterior parietal cortex and short-term associative memory – Differential effects of constant vs. theta frequency oscillatory stimulation
VL  - 141
DO  - 10.1016/j.clinph.2022.07.009
ER  - 

@conference{
author = "Živanović, Marko and Bjekić, Jovana and Konstantinović, Uroš and Filipović, Saša R.",
year = "2022",
abstract = "Transcranial electric stimulation (tES) techniques are promising tools for neuromodulation of memory functions. However, previous findings on their effectiveness are inconsistent, and there have been only a few studies directly contrasting different types of stimulation and examining their differential effects on memory performance. The study objective was the comparative assessment of the online effects of three types of tES over the left posterior parietal cortex (PPC) on the enhancement of short-term associative memory. The three tES types were constant anodal
tDCS (1.5mA), and two types of personalized theta frequency (4-8Hz) oscillatory stimulation protocols - oscillatory tDCS (otDCS, 1.5mA ± 0.5mA) and tACS (0 ± 1mA). Participants (N = 40) took part in the sham-controlled cross-over experiment where they performed parallel forms of the short-term associative memory task while receiving different stimulation types in four counterbalanced experimental sessions (tDCS, otDCS, tACS, and sham). The stimuli within the
short-term associative memory task consisted of digit-color association sequences in which single-digits (0-9) were presented sequentially on the cards of different colors. Participants were instructed to try to remember the digit-color associations presented in each sequence. The length of sequences varied between three (low-demand) to five stimuli (high-demand). At the end of each sequence, the participants were presented with one of the previously seen colored cards, and they needed to recall the digit that was presented on a given card. Planned contrasts within repeated-measures ANOVA showed that relative to sham constant anodal tDCS improved short-term associative memory for both low- and high-demand sequences, while two oscillatory protocols improved memory performance in high-demand sequences only. The results indicate that different stimulation protocols potentially affect different cognitive processes. Namely, the effects of constant anodal tDCS on cognitive performance seem to be mediated by the facilitation of low-level attention processes, while the effects of both otDCS and tACS appear to affect processes that are more central to the associative binding.",
journal = "Clinical Neurophysiology",
title = "Transcranial electric stimulation over posterior parietal cortex and short-term associative memory – Differential effects of constant vs. theta frequency oscillatory stimulation",
volume = "141",
doi = "10.1016/j.clinph.2022.07.009"
}

Živanović, M., Bjekić, J., Konstantinović, U.,& Filipović, S. R.. (2022). Transcranial electric stimulation over posterior parietal cortex and short-term associative memory – Differential effects of constant vs. theta frequency oscillatory stimulation. in Clinical Neurophysiology, 141.
https://doi.org/10.1016/j.clinph.2022.07.009

Živanović M, Bjekić J, Konstantinović U, Filipović SR. Transcranial electric stimulation over posterior parietal cortex and short-term associative memory – Differential effects of constant vs. theta frequency oscillatory stimulation. in Clinical Neurophysiology. 2022;141.
doi:10.1016/j.clinph.2022.07.009 .

Živanović, Marko, Bjekić, Jovana, Konstantinović, Uroš, Filipović, Saša R., "Transcranial electric stimulation over posterior parietal cortex and short-term associative memory – Differential effects of constant vs. theta frequency oscillatory stimulation" in Clinical Neurophysiology, 141 (2022),
https://doi.org/10.1016/j.clinph.2022.07.009 . .

TY  - JOUR
AU  - Živanović, Marko
AU  - Bjekić, Jovana
AU  - Konstantinović, Uroš
AU  - Filipović, Saša R.
PY  - 2022
UR  - http://reff.f.bg.ac.rs/handle/123456789/4006
AB  - Associative memory (AM) is the ability to remember and retrieve multiple items bound together.
Previous studies aiming to modulate AM by various transcranial electric stimulation (tES) techniques were inconclusive, although overall suggestive that tES could be a tool for AM enhancement. However, evidence from a direct comparison between different tES techniques is lacking. Here, in a sham-controlled cross-over experiment, we comparatively assessed the effects of three types of tES—anodal tDCS, theta-band transcranial alternating current stimulation (tACS), and theta-oscillatory tDCS (otDCS), delivered over the left posterior parietal cortex, during a short-term digit-color AM task with cued-recall. The effects were tested in 40 healthy young participants while both oscillatory tES were delivered at a previously determined individual theta frequency (4–8 Hz). All three active stimulations facilitated the overall AM performance, and no differences could be detected between them on direct comparison. However, unlike tDCS, the effects of which appeared to stem mainly from the facilitation of low-memory demand trials, both theta-modulated tACS and otDCS primarily promoted AM in high memory demand trials. Comparable yet differential effects of tDCS, theta tACS, and otDCS could be attributed to differences in their presumed modes of action.
PB  - Springer Nature
T2  - Scientific Reports
T1  - Effects of online parietal transcranial electric stimulation on associative memory: a direct comparison between tDCS, theta tACS, and theta-oscillatory tDCS
SP  - 14091
VL  - 12
DO  - 10.1038/s41598-022-18376-5
ER  - 

@article{
author = "Živanović, Marko and Bjekić, Jovana and Konstantinović, Uroš and Filipović, Saša R.",
year = "2022",
abstract = "Associative memory (AM) is the ability to remember and retrieve multiple items bound together.
Previous studies aiming to modulate AM by various transcranial electric stimulation (tES) techniques were inconclusive, although overall suggestive that tES could be a tool for AM enhancement. However, evidence from a direct comparison between different tES techniques is lacking. Here, in a sham-controlled cross-over experiment, we comparatively assessed the effects of three types of tES—anodal tDCS, theta-band transcranial alternating current stimulation (tACS), and theta-oscillatory tDCS (otDCS), delivered over the left posterior parietal cortex, during a short-term digit-color AM task with cued-recall. The effects were tested in 40 healthy young participants while both oscillatory tES were delivered at a previously determined individual theta frequency (4–8 Hz). All three active stimulations facilitated the overall AM performance, and no differences could be detected between them on direct comparison. However, unlike tDCS, the effects of which appeared to stem mainly from the facilitation of low-memory demand trials, both theta-modulated tACS and otDCS primarily promoted AM in high memory demand trials. Comparable yet differential effects of tDCS, theta tACS, and otDCS could be attributed to differences in their presumed modes of action.",
publisher = "Springer Nature",
journal = "Scientific Reports",
title = "Effects of online parietal transcranial electric stimulation on associative memory: a direct comparison between tDCS, theta tACS, and theta-oscillatory tDCS",
pages = "14091",
volume = "12",
doi = "10.1038/s41598-022-18376-5"
}

Živanović, M., Bjekić, J., Konstantinović, U.,& Filipović, S. R.. (2022). Effects of online parietal transcranial electric stimulation on associative memory: a direct comparison between tDCS, theta tACS, and theta-oscillatory tDCS. in Scientific Reports
Springer Nature., 12, 14091.
https://doi.org/10.1038/s41598-022-18376-5

Živanović M, Bjekić J, Konstantinović U, Filipović SR. Effects of online parietal transcranial electric stimulation on associative memory: a direct comparison between tDCS, theta tACS, and theta-oscillatory tDCS. in Scientific Reports. 2022;12:14091.
doi:10.1038/s41598-022-18376-5 .

Živanović, Marko, Bjekić, Jovana, Konstantinović, Uroš, Filipović, Saša R., "Effects of online parietal transcranial electric stimulation on associative memory: a direct comparison between tDCS, theta tACS, and theta-oscillatory tDCS" in Scientific Reports, 12 (2022):14091,
https://doi.org/10.1038/s41598-022-18376-5 . .

TY  - CONF
AU  - Stanković, Marija
AU  - Bjekić, Jovana
AU  - Živanović, Marko
AU  - Filipović, Saša R.
PY  - 2021
UR  - http://reff.f.bg.ac.rs/handle/123456789/4869
AB  - Transcranial Direct Current Stimulation (tDCS) is a valuable tool in cognitive research as sham condition enables causal conclusions about neural substrates of cognitive functions. Since tDCS studies often yield inconsistent findings, there has been a growing interest in factors that may moderate the effects, one of which being the participants’ awareness of the tDCS condition (real or sham) they received. Here we explore if participants’ beliefs about received stimulation types impacted their task performance in tDCS experiments on associative (AM) and working memory (WM). We analysed data from four within-subject, sham-controlled tDCS memory experiments. Eighty-two young, healthy volunteers took part in four experiments. Two AM experiments included 20 minutes of anodal 1.5mA tDCS over posterior-parietal cortex (PPC) – left in Experiment 1; right in Experiment 2. WM experiments targeted PPC and dorsolateral prefrontal cortex (DLPFC) – left side in Experiment 3; right side in Experiment 4, with 20 minutes of 1.8mA anodal tDCS. The participants completed memory tasks immediately following the stimulation. Results revealed that correct sham guessing had no effects on AM improvement in Experiments 1 and Experiment 2. Similarly, the group that accurately guessed sham condition did not have higher enhancement of verbal and spatial WM performance in neither Experiment 3 nor Experiment 4. Therefore, we found no evidence that the awareness of the tDCS-condition leads to better memory performance in within-subject experiments.
C3  - Book of abstracts - International scientific conference 25th Ramiro and Zoran Bujas days
T1  - No evidence of tDCS placebo-effect on associative and working memory performance in healthy adults
SP  - 152
UR  - https://hdl.handle.net/21.15107/rcub_reff_4869
ER  - 

@conference{
author = "Stanković, Marija and Bjekić, Jovana and Živanović, Marko and Filipović, Saša R.",
year = "2021",
abstract = "Transcranial Direct Current Stimulation (tDCS) is a valuable tool in cognitive research as sham condition enables causal conclusions about neural substrates of cognitive functions. Since tDCS studies often yield inconsistent findings, there has been a growing interest in factors that may moderate the effects, one of which being the participants’ awareness of the tDCS condition (real or sham) they received. Here we explore if participants’ beliefs about received stimulation types impacted their task performance in tDCS experiments on associative (AM) and working memory (WM). We analysed data from four within-subject, sham-controlled tDCS memory experiments. Eighty-two young, healthy volunteers took part in four experiments. Two AM experiments included 20 minutes of anodal 1.5mA tDCS over posterior-parietal cortex (PPC) – left in Experiment 1; right in Experiment 2. WM experiments targeted PPC and dorsolateral prefrontal cortex (DLPFC) – left side in Experiment 3; right side in Experiment 4, with 20 minutes of 1.8mA anodal tDCS. The participants completed memory tasks immediately following the stimulation. Results revealed that correct sham guessing had no effects on AM improvement in Experiments 1 and Experiment 2. Similarly, the group that accurately guessed sham condition did not have higher enhancement of verbal and spatial WM performance in neither Experiment 3 nor Experiment 4. Therefore, we found no evidence that the awareness of the tDCS-condition leads to better memory performance in within-subject experiments.",
journal = "Book of abstracts - International scientific conference 25th Ramiro and Zoran Bujas days",
title = "No evidence of tDCS placebo-effect on associative and working memory performance in healthy adults",
pages = "152",
url = "https://hdl.handle.net/21.15107/rcub_reff_4869"
}

Stanković, M., Bjekić, J., Živanović, M.,& Filipović, S. R.. (2021). No evidence of tDCS placebo-effect on associative and working memory performance in healthy adults. in Book of abstracts - International scientific conference 25th Ramiro and Zoran Bujas days, 152.
https://hdl.handle.net/21.15107/rcub_reff_4869

Stanković M, Bjekić J, Živanović M, Filipović SR. No evidence of tDCS placebo-effect on associative and working memory performance in healthy adults. in Book of abstracts - International scientific conference 25th Ramiro and Zoran Bujas days. 2021;:152.
https://hdl.handle.net/21.15107/rcub_reff_4869 .

Stanković, Marija, Bjekić, Jovana, Živanović, Marko, Filipović, Saša R., "No evidence of tDCS placebo-effect on associative and working memory performance in healthy adults" in Book of abstracts - International scientific conference 25th Ramiro and Zoran Bujas days (2021):152,
https://hdl.handle.net/21.15107/rcub_reff_4869 .

TY  - JOUR
AU  - Vukčević Marković, Maša
AU  - Kovacević, Nikola
AU  - Bjekić, Jovana
PY  - 2021
UR  - http://reff.f.bg.ac.rs/handle/123456789/3303
PB  - Frontiers Media Sa, Lausanne
T2  - Frontiers in Psychiatry
T1  - Refugee Status Determination Procedure and Mental Health of the Applicant: Dynamics and Reciprocal Effects
VL  - 11
DO  - 10.3389/fpsyt.2020.587331
ER  - 

@article{
author = "Vukčević Marković, Maša and Kovacević, Nikola and Bjekić, Jovana",
year = "2021",
publisher = "Frontiers Media Sa, Lausanne",
journal = "Frontiers in Psychiatry",
title = "Refugee Status Determination Procedure and Mental Health of the Applicant: Dynamics and Reciprocal Effects",
volume = "11",
doi = "10.3389/fpsyt.2020.587331"
}

Vukčević Marković, M., Kovacević, N.,& Bjekić, J.. (2021). Refugee Status Determination Procedure and Mental Health of the Applicant: Dynamics and Reciprocal Effects. in Frontiers in Psychiatry
Frontiers Media Sa, Lausanne., 11.
https://doi.org/10.3389/fpsyt.2020.587331

Vukčević Marković M, Kovacević N, Bjekić J. Refugee Status Determination Procedure and Mental Health of the Applicant: Dynamics and Reciprocal Effects. in Frontiers in Psychiatry. 2021;11.
doi:10.3389/fpsyt.2020.587331 .

Vukčević Marković, Maša, Kovacević, Nikola, Bjekić, Jovana, "Refugee Status Determination Procedure and Mental Health of the Applicant: Dynamics and Reciprocal Effects" in Frontiers in Psychiatry, 11 (2021),
https://doi.org/10.3389/fpsyt.2020.587331 . .

TY  - RPRT
AU  - Vukčević Marković, Maša
AU  - Stanković, Irena
AU  - Živić, Isidora
AU  - Stojadinović, Irena
AU  - Bobić, Aleksandra
AU  - Šapić, Draga
AU  - Milić, Ana
AU  - Bjekić, Jovana
PY  - 2021
UR  - http://reff.f.bg.ac.rs/handle/123456789/5540
AB  - In 2021, 96% of refugees experienced at least one trauma during their travel. Traumatic events in transit changed, but overall did not decrease over the last 5 years. Psychological screening shows that 85% of refugees are vulnerable in regard to their mental health, i.e. in need of psychological assistance and support. In comparison to previous years, all indicators of mental health and resilience took on a negative turn – with more people experiencing symptoms of depression, anxiety, and traumarelated stress. furthermore, lower coping capacities have been documented, with this all leading to higher number of refugees in acute distress and in need for immediate psychological support.
PB  - Psychosocial Innovation Network
T2  - Mental Health and Wellbeing of Refugees and Asylum Seekers in Serbia: 5 years data trends
T1  - Mental Health and Wellbeing of Refugees and Asylum Seekers in Serbia: 5 years data trends
UR  - https://hdl.handle.net/21.15107/rcub_reff_5540
ER  - 

@techreport{
author = "Vukčević Marković, Maša and Stanković, Irena and Živić, Isidora and Stojadinović, Irena and Bobić, Aleksandra and Šapić, Draga and Milić, Ana and Bjekić, Jovana",
year = "2021",
abstract = "In 2021, 96% of refugees experienced at least one trauma during their travel. Traumatic events in transit changed, but overall did not decrease over the last 5 years. Psychological screening shows that 85% of refugees are vulnerable in regard to their mental health, i.e. in need of psychological assistance and support. In comparison to previous years, all indicators of mental health and resilience took on a negative turn – with more people experiencing symptoms of depression, anxiety, and traumarelated stress. furthermore, lower coping capacities have been documented, with this all leading to higher number of refugees in acute distress and in need for immediate psychological support.",
publisher = "Psychosocial Innovation Network",
journal = "Mental Health and Wellbeing of Refugees and Asylum Seekers in Serbia: 5 years data trends",
title = "Mental Health and Wellbeing of Refugees and Asylum Seekers in Serbia: 5 years data trends",
url = "https://hdl.handle.net/21.15107/rcub_reff_5540"
}

Vukčević Marković, M., Stanković, I., Živić, I., Stojadinović, I., Bobić, A., Šapić, D., Milić, A.,& Bjekić, J.. (2021). Mental Health and Wellbeing of Refugees and Asylum Seekers in Serbia: 5 years data trends. in Mental Health and Wellbeing of Refugees and Asylum Seekers in Serbia: 5 years data trends
Psychosocial Innovation Network..
https://hdl.handle.net/21.15107/rcub_reff_5540

Vukčević Marković M, Stanković I, Živić I, Stojadinović I, Bobić A, Šapić D, Milić A, Bjekić J. Mental Health and Wellbeing of Refugees and Asylum Seekers in Serbia: 5 years data trends. in Mental Health and Wellbeing of Refugees and Asylum Seekers in Serbia: 5 years data trends. 2021;.
https://hdl.handle.net/21.15107/rcub_reff_5540 .

Vukčević Marković, Maša, Stanković, Irena, Živić, Isidora, Stojadinović, Irena, Bobić, Aleksandra, Šapić, Draga, Milić, Ana, Bjekić, Jovana, "Mental Health and Wellbeing of Refugees and Asylum Seekers in Serbia: 5 years data trends" in Mental Health and Wellbeing of Refugees and Asylum Seekers in Serbia: 5 years data trends (2021),
https://hdl.handle.net/21.15107/rcub_reff_5540 .