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Prof. Sayim studied Psychology and Computer Science at Kiel University and at the University of California in San Diego. After a Master thesis on color vision, he joined the Ph.D. Program in Neuroscience at the Ecole polytechnique federale de Lausanne (EPFL) where he investigated spatial vision in Prof. Michael Herzog's laboratory, and graduated with a dissertation on grouping and Gestalt in visual contextual modulation. Following postdoctoral research with Prof. Patrick Cavanagh in Paris, and Prof. Johan Wagemans at the University of Leuven, he was Visiting Professor at the Royal Academy of Fine Arts in Antwerp. He is currently head of the Psychophysics of Appearance Laboratory at the Institute of Psychology, University of Bern, and research scientist in the SCALab at the Unversity of Lille, CNRS, France.


Yildirim, F. Z., Coates, D. R., & Sayim, B. (under review). Hidden by bias: How standard psychophysical procedures conceal unbiased visual appearance.

Hirsch. T., Haiduk, M., & Sayim, B. (under review). Raphael’s ‘imperfect’ viol – a question of perspective.

Melnik, N., Coates, D. R., & Sayim, B. (in revision). Geometrically Restricted Image Descriptors: A method to capture the appearance of shape.

Taylor, H., & Sayim, B. (in revision). ‘Redundant Letters Lost: Redundancy Masking and the Identity Crowding Debate.

Doerig, A., Schmittwilken, L., Sayim, B. Manassi, M., Herzog, M. H. (2020). Capsule networks as recurrent models of grouping and segmentation PLOS Computational Biology. 16(7), e1008017. doi: https://doi.org/10.1167/jov.20.4.14. [download] [online]

Yildirim, F. Z., Coates, D. R., & Sayim, B. (2020). Redundancy masking: The loss of repeated items in crowded peripheral vision. Journal of Vision. 20(4), 14-14. doi: https://doi.org/10.1167/jov.20.4.14. [download] [online]

Melnik, N., Coates, D. R., & Sayim, B (2020). Emergent features break the rules of crowding. scientific Reports 10(1), 1-10. https://doi.org/10.1038/s41598-019-57277-y. [download] [online]

Sayim B, & Taylor H (2019). Letters lost: capturing appearance in crowded peripheral vision reveals a new kind of masking. Psychological Science, 30(7), 1082-1086. https://doi.org/10.1177/0956797619847166.[download] [online]

Rummens K, & Sayim B (2019). Disrupting uniformity: Feature contrasts that reduce crowding interfere with peripheral word recognition. Vision research, 161, 25-35.

Melnik N, Coates DR, Sayim B (2018). Emergent features in the crowding zone: When target-flanker grouping surmounts crowding. Journal of Vision. September 2018, Vol. 18, 19. doi:10.1167/18.9.19. http://jov.arvojournals.org/article.aspx?articleid=2703422

Taylor JH, Sayim B (2018). Crowding, Attention and Consciousness: In support of the Inference Hypothesis. Mind Lang. 2018;1-17. https://doi.org/10.1111/mila.12169

Sayim B, Franke I (2018). Towards a Phenomenology of the Unknown. In H. C. Mertens, K. Naie, Retreat into Darkness: Towards a Phenomenology of the Unknown. Berlin, Schering Foundation.

Sayim B, Wagemans J. (2017). Appearance changes and error distributions in crowding revealed by drawings. Journal of Vision, September 2017, Vol. 17, 8. https://doi.org/10.1167/17.11.8.

Coates DR, Wagemans J, Sayim B (2017). Diagnosing the visual periphery: Using the Rey-Osterrieth Complex Figure Test to evaluate peripheral visual function. i-Perception. doi: 10.1177/2041669517705447.

Greenwood, JA, Szinte, M, Sayim, B, & Cavanagh, P (2017). Variations in crowding, saccadic precision, and spatial localization reveal the shared topology of spatial vision. Proceedings of the National Academy of Sciences, 201615504. doi:10.1073/pnas.1615504114

Ekroll V, Sayim B, Wagemans J (2017). The other side of magic: The psychology of perceiving hidden things. Perspectives on Psychological Science, 12(1), 91-106.

Herzog MH, Sayim B, Manassi M, Chicherov V (2016). What crowds in crowding? Journal of Vision, September 2016, Vol.16, 25. doi:10.1167/16.11.25.

Ekroll V, Sayim B, van der Hallen R, Wagemans J (2016). Illusory visual completion of an object’s invisible backside can make your finger feel shorter. Current Biology 26, no. 8 (April 25, 2016): 1029–33.

Overvliet KE1, Sayim B1 (2015). Perceptual grouping determines haptic contextual modulation. Vision Research. Available online, paper in press. [1 joint first author]

Sayim B, Myin E, Van Uytven T (2015). Prior knowledge modulates peripheral color appearance. Proceedings of the International Colour Association (AIC), Tokyo Midterm meeting, 2015, 1147-1152.

Herzog MH, Sayim B, Chicherov V, Manassi M (2015). Crowding, grouping, and object recognition: a matter of appearance. Journal of Vision, 15(6):5, 1–18.

Sayim B, Greenwood JG, Cavanagh P (2014). Foveal target repetitions reduce crowding. Journal of Vision.14 (6):4, 1-12.

Greenwood JG, Sayim B, Cavanagh P (2014). Crowding is reduced by onset transients in the target object (but not in the flankers). Journal of Vision, 14 (6):2, 1-21.

Sayim B, Manassi M, Herzog MH (2014). How color, regularity, and Gestalt determine backward masking, Journal of Vision, 14(7):8, 1-11.

Ekroll V, Sayim B, Wagemans J (2013). Against better knowledge: The magical force of amodal volume completion. i-perception, 4, 511-515.

Manassi M, Sayim B, Herzog MH (2013). When crowding of crowding leads to uncrowding. Journal of Vision. 13(13):10, 1–10.

Sayim B, Cavanagh P (2013). Grouping and Crowding Affect Target Appearance over Different Spatial Scales. PLoS ONE 8(8): e71188.

Manassi M, Sayim B, Herzog MH (2012). Grouping, pooling, and when bigger is better in visual crowding. Journal of Vision, 12(10):13, 1–14.

Sayim B, Cavanagh P (2011). What line drawings reveal about the visual brain. Front. Hum. Neurosci. 5:118.

Sayim B, Cavanagh P (2011). The Art of Transparency. i-Perception, 2(7), 679-696.

Sayim B, Wesheimer G, Herzog MH (2011). Quantifying target conspicuity in contextual modulation by visual search. Journal of Vision, 11(1):6, 1-11.

Sayim B, Grubert A, Herzog MH, Krummenacher J (2010). Display probability modulates attentional capture by onset distractors. Journal of Vision, 10(3):10, 1-8.

Sayim B, Westheimer G, Herzog MH (2010). Gestalt Factors Modulate Basic Spatial Vision. Psychological Science, 21(5):641-4.

Saarela TP, Sayim B, Westheimer G, Herzog MH (2009). Global stimulus configuration modulates crowding. Journal of Vision, 9(2):5, 1-11.

Sayim B, Westheimer G, Herzog MH (2008). Contrast polarity, chromaticity, and stereoscopic depth modulate contextual interactions in vernier acuity. Journal of Vision, 8(8):12, 1-9.

Sayim B, Jameson KA, Alvarado N, Szeszel M (2005). Semantic and perceptual representations of color: Evidence of a shared color naming function. Journal of Cognition and Culture, 5, 165-220.