Gür, Ezgi
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Gur, Ezgi
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ezgi.gur@ieu.edu.tr
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02.04. Psychology
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Current Staff
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Sustainable Development Goals
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17
Citations
151
h-index
8
Documents
18
Citations
148
Scholarly Output
7
Articles
5
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26/2573
Supervised MSc Theses
1
Supervised PhD Theses
0
WoS Citation Count
5
Scopus Citation Count
5
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2
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2
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0
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0
WoS Citations per Publication
0.71
Scopus Citations per Publication
0.71
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2
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1
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7 results
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Article Mice Extrapolate Temporal Information Based on Previously Learned Spatiotemporal Mappings: An Asymmetrical Case(Springer, 2026) Gur, Ezgi; Duyan, Yalcin A.; Toptas, Pinar; Balci, FuatOne of the computational affordances of isomorphic magnitude representations is the extrapolation of temporal information based on previously experienced spatiotemporal pairings. We initially trained mice on the association of two intervals (10 s and 30 s) with two hoppers (H2 and H4, counterbalanced) in a five-choice nose-poke box with the following setup. One of the three novel hoppers (H1) neighbored H2 only, the other novel hopper (H5) neighbored H4 only, and the third novel hopper (H3) neighbored H2 and H4 (H1Novel -> H2Trained -> H3Novel -> H4Trained -> H5Novel). During test trials, one of the five hoppers was illuminated. We estimated the trial time at which the anticipatory response rate was maximal (peak time) separately for each hopper. Mice extrapolated temporal information only in a forward fashion; the peak time for H5 was longer than that for H4. Mice did not extrapolate temporal information backward; the timed response curves in H1 and H3 were closely similar to those in H2. Thus, our findings suggest that mice can extrapolate temporal information, but also indicate that the computations underlying this process are directionally constrained. We discuss the possible reasons behind asymmetrical extrapolation.Article Citation - WoS: 2Citation - Scopus: 2Revisiting the Snarc Effect: Testing Magnitude Classification in a Turkish Sample Typically Lacking the Snarc Effect(Routledge Journals, Taylor & Francis Ltd, 2025) Dural, Seda; Cetinkaya, Hakan; Hepdarcan, Ilgim; Gur, Ezgi; Korkut, IlaydaThis study investigates the SNARC effect in Turkish participants using a magnitude classification task to examine the roles of semantic influences and cultural experiences. While prior research has shown the absence of the SNARC effect in a parity judgment among Turkish participants who read from left to right, our findings further confirm its absence in a magnitude classification task, even when semantic demands are minimised. Instead, a robust distance effect was observed, pointing out the involvement of spatial number processing in the task. These findings are discussed in the context of possible multiple spatial mappings, shaped by Turkey's unique cultural and historical background, which may hinder the development of a dominant spatial-numerical association. Future research incorporating explicit spatial primes linked to various cultural experiences could clarify the mechanisms underlying the variability of SNARC effects and offer valuable insights into the relationship between cultural history and cognitive processes.Article A Rudimentary Form of Time-Dependent Awareness in Mice(Springer, 2025) Minary, Alexa; Gur, Ezgi; Balci, FuatKeeping track of event times and the uncertainty in the resultant representation time intervals is pivotal for adaptive decision-making and action planning. To this end, earlier experiments showed that humans and rodents can generate adaptive biases in decision-making considering their representational timing uncertainty. More recent studies showed that humans and rats can also track whether and how much one has underestimated or overestimated the duration of an event (resulting from timing uncertainty). These studies overlooked a more rudimentary form of time-dependent awareness-that is, knowing whether or not a response is emitted under temporal control. This type of dual-system control is a common feature of responses in tasks requiring animals to wait. We tested this hypothesis in C57BL/6 male mice (N = 16) that were trained to depress a lever for a minimum target duration to receive a reward. No reward was given when mice under-produced the minimum required target interval. During test trials, the rate of nose-pokes into the food hopper during a variable response window following time production was recorded. Mice nose-poked more vigorously (reflecting higher reward expectancy) following temporal productions around the target duration compared with when they underproduced the minimum target interval. This result suggests that mice can monitor whether their responses resulted from temporal control versus its failure. Our findings point to a rudimentary form of time-dependent awareness in mice.Article Midbrain Dopamine Warps Subjective Time via Threshold Setting But Not Clock Speed(Soc Neuroscience, 2026) Erdagi, Alihan; Gur, Ezgi; Balci, FuatInterval timing is an evolutionarily well-preserved function that presents similar behavioral signatures across different species. However, the neural basis of interval timing remains an open question. For instance, although dopamine has been implicated as a vital component of the internal clock, its precise role is debated due to equivocal findings from various methodologies and their interpretations. We tested this question by optogenetically exciting versus inhibiting tyrosine hydroxylase-positive (TH+) neurons of the substantia nigra pars compacta while male mice produced at least a 3-s-long interval by depressing a lever for reward. Excitation of TH+ neurons shifted their timing behavior to the right, while inhibition led to a shift to the left. Our drift-diffusion timing model-based analysis of the behavioral data clearly showed that TH+ neuron excitation and inhibition heightened and lowered the timing threshold, respectively, without affecting the rate of temporal integration (i.e., clock speed). Our work attributes a clear mechanistic role (i.e., threshold setting) to nigrostriatal dopaminergic function as part of the internal clock.Article Citation - WoS: 3Citation - Scopus: 3Testing the Memory Reconsolidation Hypothesis in a Fear Extinction Paradigm: the Effects of Ecological and Arbitrary Stimuli(Springer, 2022) Dural, Seda; Gur, Ezgi; Cetinkaya, HakanVarious studies demonstrated that extinction training taking place shortly after the activation of the acquired fear could weaken the conditioned fear. The procedure is called post-retrieval extinction (PRE). However, from the time it emerged, it has suffered from inconsistencies in the ability of researchers to replicate the seemingly established effects. Extant literature implies that conditioned fear might be differentially sensitive to the nature of conditioned stimuli (CS) used. The aim of the present study, therefore, is threefold. First, we aimed to replicate Schiller et al. (Nature, 463, 49-53.2010) procedure in which the PRE had produced positive results with arbitrary CSs only. Also, we examined the PRE as a function of CS type (ecological-fear-relevant (images of spider and snake) vs. arbitrary (images of yellow and blue circles)). Finally, we aimed to investigate the long-term effects of the PRE (i.e., 24 h, 15 d, and 3 mo). The study consisted of acquisition, re-activation and extinction, and re-extinction phases. Dependent measure was the recovery of fear responses as indexed by the skin conductance responses (SCRs) and arousal ratings of the participants at the last trial of the extinction and the first trial of the re-extinction. All groups showed significant acquisition and extinction patterns, compared to the other two groups (i.e., 6 h after the activating CS and without an activating stimulus) only the group that undertook extinction trials 10 min after the activating CS showed a sustained extinction. Thus, our findings provided further evidence for the robustness of the PRE paradigm in preventing the recovery of extinguished fears behaviorally, both with ecological and arbitrary stimuli.Master Thesis The Long-Lasting Effects of Extinction During the Reconsolidation Process of Fear Memory(İzmir Ekonomi Üniversitesi, 2014) Gür, Ezgi; Çetinkaya, Seda DuralBu tezde, korku belleğinin yeniden-bütünleştirme sürecine uygulanan sönme işleminin zamana bağlı ve uzun süreli etkileri incelenmiştir. Schiller ve arkadaşları (2010) tarafından geliştirilen ve üç aşamadan oluşan (edinim, sönme, yeniden sönme) yeniden-bütünleştirme güncelleme paradigması, söz konusu işlem yolunun korku tepkilerinin önlenmesindeki zamana bağlı etkilerini incelemek üzere kullanılmış, ayrıca uzun süreli etkilerin incelenmesi için sönme işleminden bir yıl sonra bir takip çalışması yürütülmüştür. Sönme işlemi katılımcılara hatırlatıcı sunumundan 10 dakika sonra (yeniden-bütünleştirme penceresi içinde), hatırlatıcı sunumundan 6 saat sonra (yeniden-bütünleştirme penceresi dışında) ve hatırlatıcı sunumu olmaksızın (standart sönme işlemi) uygulanmıştır. Korku tepkilerinin kendiliğinden geri gelmesi ise sönme işleminden 24 saat sonra, 15 gün sonra ve 3 ay sonra olmak üzere üç ayrı düzeyde manipüle edilmiştir. Çalışmada gruplar arası karşılaştırmaları gerçekleştirmek üzere 3 (Sönme: Hatırlatıcıdan 10 dakika ve 6 saat sonra ve hatırlatıcı sunumu olmaksızın) x 3 (Yeniden sönme: sönme işleminden 24 saat, 15 gün, 3 ay sonra) denekler arası desen kullanılmıştır. Katılımcıların deri iletkenliği tepkisi aracılığıyla ölçülen korku tepkileri her aşama için kaydedilmiştir. Çalışmanın sonuçları, yeniden sönme süreci dışında ve hatırlatıcı uyarıcı sunumu olmaksızın uygulanan sönme işlemlerine kıyasla, sönme işlemi yeniden bütünleştirme süreci içerisinde uygulandığında korku tepkilerinin anlamlı bir şekilde daha az geri geldiğini ve bu durumun yeniden-sönme manipülasyonundan bağımsız olduğunu göstermiştir. Fakat, uzun süreli etkilerin incelendiği bir yıl sonraki takip çalışmasında söz konusu etkiye rastlanmamıştır.Conference Object Revisiting the SNARC Effect With Magnitude Comparison Task in a Null-SNARC Sample(John Wiley & Sons Ltd, 2024) Korkut, Ilayda; Cetinkaya, Hakan; Hepdarcan, Ilgim; Gur, Ezgi; Dural, Seda
