Jovana Bjekic

Jovana Bjekic
University of Belgrade · Institute for Medical Research

PhD

About

77
Publications
44,575
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Introduction
Jovana Bjekic currently works at the Human Neuroscience department of the Institute for Medical Research, University of Belgrade. Jovana does research in Neuropsychology, Experimental Psychology and Behavioural Science.

Publications

Publications (77)
Article
Full-text available
LIWC (Linguistic Inquiry and Word Count) is widely used word-level content analysis software. It was used in large number of studies in the fields of clinical, social and personality psychology, and it is adapted for text analysis in 11 world languages. The aim of this research was to validate empirically newly constructed adaptation of LIWC softwa...
Article
Associative memory plays a key role in everyday functioning, but it declines with normal aging as well as due to various pathological states and conditions, thus impairing quality of life. Associative memory enhancement via neurostimulation over frontal areas resulted in limited success, while posterior stimulation sites seemed to be more promising...
Article
Associative memory (AM), an ability to form and retrieve associations between information units is crucial for everyday functioning and is affected by ageing as well as by different neurological conditions. It was shown that rTMS over posterior parietal cortex (PPC) can improve AM of face-word pairs. Therefore, we examined if tDCS will produce comp...
Article
Full-text available
There is a growing body of evidence that a higher level of cognitive inhibition is associated with lower experimental pain sensitivity. However, a systematic examination of the association between executive functions, which include not only inhibition but also updating and shifting, and experimental pain sensitivity is lacking. This study aimed to...
Article
Background: The dorsolateral prefrontal cortex (DLPFC) plays an important role in the regulation of food intake. Several previous studies demonstrated that a single session of transcranial direct current stimulation (tDCS) of the DLPFC reduces food craving and caloric intake. Objectives: We hypothesized that repeated tDCS of the right DLPFC cort...
Preprint
Background: Mental health encompasses emotional, psychological, and social dimensions, extending beyond the mere absence of illness. Shaped by a complex interplay of hereditary factors and life experiences, mental health can deteriorate into clinical conditions necessitating intervention. However, the ambiguity between pathological and non-patholog...
Article
Full-text available
Auditory steady-state response (ASSR) is the result of the brain’s ability to follow and entrain its oscillatory activity to the phase and frequency of periodic auditory stimulation. Gamma-band ASSR has been increasingly investigated with intentions to apply it in neuropsychiatric disorders diagnosis as well as in brain–computer interface technolog...
Preprint
Associative memory (AM) is a memory domain vital for normal cognitive functioning. It declines over time due to healthy aging as well as in various neurological conditions. Standard transcranial electrical stimulation (tES) protocols show inconclusive facilitatory effects on AM, often lacking function specificity and stimulation focality. We tested...
Article
Full-text available
The experience of an infertility diagnosis and treatment imposes a profound burden on affected individuals, encompassing not only physical and medical aspects but also a plethora of psychological, social, and emotional factors. By employing a multimodal assessment featuring validated self-report questionnaires, physical measurements, and clinical r...
Article
Full-text available
Gambling disorder (GD) and internet gaming disorder (IGD) are formally recognized behavioral addictions with a rapidly growing prevalence and limited treatment options. Recently, transcranial electrical stimulation (tES) techniques have emerged as potentially promising interventions for improving treatment outcomes by ameliorating cognitive functio...
Article
Full-text available
Associative memory (AM) is the ability to bind new information into complex memory representations. Noninvasive brain stimulation (NIBS), especially transcranial electric stimulation (tES), has gained increased interest in research of associative memory (AM) and its impairments. To provide an overview of the current state of knowledge, we conducted...
Article
Full-text available
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 i...
Article
Full-text available
The ability, will, and belief that it is possible to deal effectively with members of other cultural/ethnic groups are still gaining importance all over the world. However, the majority of studies on intercultural relations focus on Western Europe and the USA, applying constructs and theories that replicate a western-centered worldview. As a conseq...
Article
Full-text available
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 t...
Article
Full-text available
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 t...
Conference Paper
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 c...
Poster
Full-text available
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...
Presentation
Transkranijalna stimulacija istosmjernom strujom (tDCS) je neinvazivni postupak stimulacije mozga koji nalazi svoju primjenu i u području osnaživanja kognitivnih sposobnosti. Istraživanja pokazuju da stimulacija parijetalnih regija može pospješiti međupovezanost kortikalno-hipokampalne mreže i osnažiti asocijativno pamćenje. Cilj ovog istraživanja...
Conference Paper
Full-text available
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 th...
Poster
Full-text available
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 rese...
Conference Paper
Full-text available
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 effect...
Article
Full-text available
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 pariet...
Preprint
Full-text available
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 effect...
Article
Full-text available
This study assessed the level of knowledge, attitudes, and practices (KAP) regarding tick-borne encephalitis virus (TBEV) and tick-borne diseases (TBDs) among different groups of people in Serbia. Professionally tick-exposed persons (PTEPs), health care workers (HCWs), and the general population (GP) were subjected to an anonymous, voluntary, onlin...
Article
Full-text available
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 e...
Article
Full-text available
Memory enhancement is one of the great challenges in cognitive neuroscience and neurorehabilitation. Among various techniques used for memory enhancement, transcranial direct current stimulation (tDCS) is emerging as an especially promising tool for improvement of memory functions in a non-invasive manner. Here, we present a tDCS protocol that can...
Article
Full-text available
Due to proceeding globalization processes, involving a rise in mobility and international interdependencies, the frequency and relevance of intercultural contact situations increases. Consequently, the ability to deal effectively with intercultural situations is gaining in importance. However, the majority of studies on measures of intercultural co...
Article
The objective of the study was to investigate the validity of IAT in the assessment of the Big five personality traits. We employed the Multi-Trait Multi-Method (MTMM) approach on a sample of 146 respondents. We collected measures on IATs assessing Big five personality traits, self-reports, and two ratings of close others of different gender on NEO...
Article
Full-text available
Brain electrophysiological activity within the low gamma frequencies (30–80 Hz) has been proposed to reflect information encoding and transfer processes. The 40-Hz auditory steady-state response (40-Hz ASSR) is frequently discussed in relation to changed cognitive processing in neuropsychiatric disorders. However, the relationship between ASSRs and...
Article
Full-text available
The auditory steady-state response (ASSR) is a result of entrainment of the brain’s oscillatory activity to the frequency and phase of temporally modulated stimuli. Gamma-range ASSRs are utilized to observe the dysfunctions of brain-synchronization abilities in neuropsychiatric and developmental disorders with cognitive symptoms. However, the link...
Article
Full-text available
Associative memory (AM) reflects the ability to remember and retrieve multiple pieces of information bound together thus enabling complex episodic experiences. Despite growing interest in the use of transcranial direct current stimulation (tDCS) for the modulation of AM, there are inconsistent evidence regarding its benefits. An alternative to stan...
Article
Full-text available
Working memory (WM) is a limited-capacity system or set of processes that enables temporary storage and manipulation of information essential for complex cognitive processes. The WM performance is supported by a widespread neural network in which fronto-parietal functional connections have a pivotal role. Transcranial direct current stimulation (tD...
Article
Full-text available
Objective: Due to the wide impact of the COVID-19 pandemic on mental health, the need for scalable interventions that can effectively reduce psychological distress has been recognized. Expressive writing (EW) can be beneficial for different conditions, including depression, suicidal ideation, and coping with trauma. Therefore, we aim to assess the...
Article
Full-text available
The process of personality judgment occurs in daily social interactions and represents an attempt to identify characteristics of someone else's personality, in the way to explain past and predict future behaviors. The results of this process have implications on future decisions and actions of people. This research aimed to examine the accuracy of...
Article
Full-text available
Neural oscillations represent a fundamental mechanism that enables coordinated action during normal brain functioning. Auditory steady-state responses (ASSRs) are used to test the ability to generate gamma-range activity. Different non-invasive brain stimulation (NIBS) techniques have the potential to modulate neural activation patterns that are ab...
Article
Full-text available
The ambulatory assessment offers a wide range of methods enabling researchers to investigate psychological, behavioral, emotional, and biological processes. These methods enable us to gather data on individual differences in language use for psychological research. Two studies were conducted with an aim to evaluate and compare the temporal stabilit...
Article
Full-text available
Background/Aim. The pharmacoinvasive (PI) therapy is a recommended strategy in patients (pts) with ST elevation myocardial infarction (STEMI) unable to undergo timely primary percutaneous coronary intervention (p-PCI). The aim of the study was to find out the cohorts of pts who are not treated by any reperfusion therapy (RT) as well to determine th...
Preprint
Full-text available
Recent neuroimaging studies showed that in addition to the dorsolateral prefrontal cortex (dlPFC), the posterior parietal cortex (PPC) plays a significant role in higher cognitive processes such as executive functions. In this study we aimed to explore the neural underpinnings of the executive function of updating by exploring the effects of transc...
Preprint
Full-text available
Spatial memory relies on efficient encoding, storage and retrieval of spatial information, which enables us to remember paths or locations of objects in everyday life. Moreover, this type of memory has been shown to decline with age and various neurodegenerative disorders. Parietal cortex has been shown to play an important role in the formation of...
Article
Full-text available
Online dialogue has tremendous potential to influence intergroup relations in conflict-ridden societies. Although prior research has identified intergroup harmony and justice as two distinct approaches to intergroup contact, little is known about whether online dialogue would foster a harmony- or justice-oriented discourse around conflict. To exami...
Article
Full-text available
Healthy aging limits the activities of daily living and personal independence. Furthermore, cognitive-motor interference in dual-task (e.g., walking while talking) appears to be more pronounced in the elderly. Transcranial direct current stimulation (tDCS), a form of the non-invasive brain stimulation technique, is known to modify cortical excitabi...
Article
Full-text available
U ovom istraživanju dopunjujemo podatke o Testu višestrukih rešenja (eng. Mutiple solutions test - MST) ispitujući konstrukt i prediktivnu validnost instrumenta. Za razliku od konvencionalnih matrica gde se traži samo jedno rešenje, MST pred ispitanike postavlja tri tipa problema, tražeći od njih da reše matricu navodeći najbolje, drugo najbolje i...
Article
Full-text available
As people outside the context of testing seldom find themselves in situations where they are presented with limited options and a single correct answer, with all others being equally wrong, a modification of traditional intelligence tests (in terms of increasing its flexibility), can potentially provide a more comprehensive and a more valid measure...
Conference Paper
Full-text available
Background Memory enhancement is one of the most challenging issues in neurorehabilitation. Memory functions are affected by different neurological conditions as well as by normal aging. Recent data suggest that it may be possible to improve performance on some of the memory tests by physiological modulation of the activity within a neural loop whi...
Conference Paper
Full-text available
Background Memory enhancement is one of the most challenging issues in neurorehabilitation. Memory functions are affected by different neurological conditions as well as by normal aging. Recent data suggest that it may be possible to improve performance on some of the memory tests by physiological modulation of the activity within a neural loop whi...
Article
Full-text available
Imageability is a psycholinguistic variable that indicates how well a word gives rise to a mental image or sensory experience. Imageability ratings are used extensively in psycholinguistic, neuropsychological, and aphasiological studies. However, little formal knowledge exists about whether and how these ratings are associated between and within la...
Article
Full-text available
Comparative research on aphasia and aphasia rehabilitation is challenged by the lack of comparable assessment tools across different languages. In English, a large array of tools is available, while in most other languages, the selection is more limited. Importantly, assessment tools are often simple translations and do not take into consideration...
Article
Full-text available
This article investigates the cross-linguistic comparability of the newly developed lexical assessment tool Cross-linguistic Lexical Tasks (LITMUS-CLT). LITMUS-CLT is a part the Language Impairment Testing in Multilingual Settings (LITMUS) battery (Armon-Lotem, de Jong & Meir, 2015). Here we analyse results on receptive and expressive word knowledg...
Article
Full-text available
The study examines applicability and usefulness of HEXACO-based model in the description of brand personality. Following contemporary theoretical developments in human personality research, Study 1 explored the latent personality structure of 120 brands using descriptors of six personality traits as defined in HEXACO model: Honesty-Humility, Emotio...
Article
Full-text available
Veliki broj istraživanja pokazuje da eksplicitni i implicitni stavovi determinišu ponašanje. Verbalna produkcija, kao bihejvioralna manifestacija unutrašnjeg sveta osobe prema savremenim psiholingvističkim teorijama predstavlja, kako nameran, tako i automatski proces. Cilj ovog istraživanja bilo je ispitivanje odnosa između različitih mera verbalno...
Article
Background: There is conflicting information about sex differences in presentation, treatment, and outcome after acute coronary syndromes (ACS) in the era of reperfusion therapy and percutaneous coronary intervention. The aim of this study was to examine presentation, acute therapy, and outcomes of men and women with ACS with special emphasis on t...
Article
Full-text available
U ovom radu predstavljena je konstrukcija i evaluacija Testa homofobije koji u sadržinskom smislu objedinjuje dosadašnja znanja i ideje o prirodi ovog fenomena. Test homofobije (H25) sastoji se od 25 stavki u formi tvrdnji kojima je pridružena petostepena skala Likertovog tipa. Na uzorku od 476 ispitanika proverene su psihometrijske karakteristike...
Article
A body of research shows that grammatical gender, although an arbitrary category, is viewed as the system with its own meaning. However, the question remains to what extent does grammatical gender influence shaping our notions about objects when both verbal and visual information are available. Two experiments were conducted. The results obtained i...
Article
Full-text available
U ovom radu predstavljena je konstrukcija i evaluacija Testa homofobije koji u sadržinskom smislu objedinjuje dosadašnja znanja i ideje o prirodi ovog fenomena. Test homofobije (H25) sastoji se od 25 stavki u formi tvrdnji kojima je pridružena petostepena skala Likertovog tipa. Na uzorku od 476 ispitanika proverene su psihometrijske karakteristike...
Article
Full-text available
U istraživanju je ispitivana razlika između umetnika i neumetnika u pogledu opšte kreativne sposobnosti i različitih aspekata kreativnosti. Uzorak je činilo 128 studenata Univerziteta u Beogradu (66 stude-nata umetničkih i 62 studenta neumetničkih fakulteta). U istraživanju je korišćen višedimenzionalni test opšte kreativnosti baziran na Gil-fordov...
Article
Full-text available
Wh-questions are among the most important and the most frequent types of utterance, which presumably reflects the role of questions in everyday life in gathering various types of information. There is a limited body of research on the exhaustivity comprehension in multiple wh-questions in children (such as, for example, Who drives what, Who gives s...
Article
Full-text available
Automatic text analysis is a methodological approach in the analysis of individual differences in verbal behaviour. It enables extraction of statistically manipulable information about intensity and/or frequency of thematic and stylistic characteristics of verbal output. LIWC (Linguistic Inquiry and Word Count), one of the widely used software solu...

Questions

Questions (2)
Question
Hi everyone,
We are conducting a meta-analysis with a focus on single–session tDCS effects on working memory. If there is anyone who is willing to share their unpublished work or manuscript not yet appeared in the following databases: MEDLINE, SCOPUS, ScienceDirect, PsycARTICLES or CENTRAL, we would be happy to include it in our study. Also, research with data on WM measure following single–session tDCS (e.g. N –back), without that necessarily being a prime focus of a study, would be of great value for us. We would also like to include data from a PhD or master thesis, so please feel free to share it as well.
If you have any further questions, I am happy to answer.
Question
We are looking for a large database (200+) of pictures of human faces with neutral facial expression, in order to conduct an experiment on nonverbal learning mechanisms. We have difficulties finding appropriate pictures because we need people in the pictures to be  Caucasian, age 20 to 40, with neutral facial expression, and on neutral background. Also, it would be very good if the database is free for research purposes use. Can somebody please suggest the existing database that he or she knows?
Thank you in advance, 
Jovana

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