Abstract
Spatial-Numerical Associations (SNAs) reflect the cognitive link between numerical magnitude and spatial orientation. While the SNARC effect, faster-left responses for small numbers and right responses for large ones, is robust in Western populations, findings from Turkish samples have been inconsistent. This study investigated whether methodological factors, including statistical power, sensitivity of measurement, and task setup, contribute to these inconsistencies. Using high-powered, lab-based parity judgment (PJ) and magnitude classification tasks, which are standard task setups when investigating the SNARC effect, as well as a novel Go/No-go (GNG) paradigm with lateralized stimuli and a central response, we examined directional SNAs in Turkish participants. Results revealed a weak reverse SNARC effect in the standard PJ task and a weak left-to-right SNA in the GNG PJ task, but no reliable group-level effects in magnitude tasks. Task setup significantly influenced directional SNA patterns, with opposite effects observed between standard and GNG PJ tasks. These findings suggest that SNAs are context-dependent, with different task setups activating distinct directional SNAs. This highlights the critical importance of methodological design when investigating SNAs.
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The pre-registration, data, and analysis are available in The Open Science Framework (OSF) at [https://osf.io/g3b84/].
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Acknowledgements
We would like to thank Prof. Martin Fischer and Prof. Samuel Shaki for their valuable suggestions regarding the measurement of directional preferences in SNARC studies.
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S.D., H.Ç, M.B., and A.C. conceptualized the study. A.C., M.Ş. and B. H. designed the experiments and collected the data. M.B and S.D. performed the formal analysis. M.B., A.C. and M.Ş wrote the original draft. S.D. and H.Ç. and B.H. reviewed and edited the manuscript. S.D. and H.Ç. supervised the project. All authors reviewed the final manuscript and approved its submission.
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Bulut, M., Candemir, A., Şefikoğlu, M. et al. Measuring SNARC effect: different task setups reveal divergent spatial-numerical associations. Sci Rep (2026). https://doi.org/10.1038/s41598-026-44140-0
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DOI: https://doi.org/10.1038/s41598-026-44140-0


