Browsing by Author "Hepdarcan, Ilgim"

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Magnitude-space representations in the n-back task: Long-term representations of magnitudes alter the working memory performance
(Springer, 2025) Ilgım Hepdarcan; Hakan Çetinkaya; Seda Dural; Dural, Seda; Cetinkaya, Hakan; Hepdarcan, Ilgim
Prior research has predominantly examined the role of working memory (WM) in tasks involving numerical information and spatial properties such as memorizing number sequences and performing parity judgment and magnitude comparison. In contrast to focusing solely on the effect of WM on number judgment tasks our study investigates how magnitude-space associations affect WM task performance emphasizing long-term representations specifically the concept of mental number line (MNL) compatibility (small items on the left large items on the right) in long-term memory (LTM). Moving from the idea of representations within LTM contribute to the functioning of WM during task execution we explore the effects of congruent incongruent and negative congruent numerical and non-numerical magnitude–space associations on magnitude-based 1-back (low WM load) and 2-back (high WM load) tasks. MNL compatible n-back and test items are congruent MNL compatible n-back and MNL incompatible (small on the right large on the left) test items (or vice versa) are incongruent and MNL incompatible n-back and test items are considered negative congruent. Because negative congruent and incongruent representations may not activate existing representations in LTM as congruent representations we expected worse WM performance in negative congruent and incongruent trials than in congruent trials. Results reveal that congruent and incongruent representations elicit more accurate and rapid responses than negative congruents suggesting that congruent and incongruent representations contribute to task execution. Additionally we observe a size effect for small numerical magnitudes and a reverse size effect for large physical magnitudes pointing towards the coactivation of LTM and WM in magnitude–space relations. © 2025 Elsevier B.V. All rights reserved.
Citation - WoS: 7
Citation - Scopus: 7
No SNARC Effect Among Left- to-Right Readers: Evidence From a Turkish Sample
(UNIV ECONOMICS & HUMAN SCIENCES WARSAW, 2023) Merve Bulut; Ilgim Hepdarcan; Ezgi Palaz; Hakan Cetinkaya; Seda Dural; Bulut, Merve; Dural, Seda; Hepdarcan, Ilgim; Palaz, Ezgi; Cetinkaya, Hakan
The spatial-numerical association of response codes (SNARC) refers to the faster left-hand respons- es to smaller numbers and faster right-hand responses to larger numbers. Although easily repli- cable in Western cultures the prevalence of the SNARC effect in other cultures has long been an issue. In the current study we aimed to replicate the SNARC effect in a parity judgement task with Turkish participants (N=66) whose reading habits are entirely left-to-right. The results revealed no SNARC effect. To the best of our knowledge this is the first finding indicating the absence of regu- lar SNARC effect among left-to-right readers in a classical parity judgement task. Based on these findings we suggest that investigations of cultural influences on spatial-numerical associations should take a broader perspective rather than only focusing on reading habits.
Revisiting the SNARC effect with magnitude comparison task in a null-SNARC sample
(JOHN WILEY & SONS LTD, 2024) Ilayda Korkut; Hakan Cetinkaya; Ilgim Hepdarcan; Ezgi Gur; Seda Dural; Korkut, Ilayda; Dural, Seda; Hepdarcan, Ilgim; Gur, Ezgi; Cetinkaya, Hakan
Citation - WoS: 3
Citation - Scopus: 2
Revisiting the SNARC effect: testing magnitude classification in a Turkish sample typically lacking the SNARC effect
(ROUTLEDGE JOURNALS TAYLOR & FRANCIS LTD, 2025) Seda Dural; Hakan Cetinkaya; Ilgim Hepdarcan; Ezgi Gur; Ilayda Korkut; Dural, Seda; Korkut, Ilayda; Hepdarcan, Ilgim; Gur, Ezgi; Cetinkaya, Hakan
This 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.