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Size-induced distortions in perceptual maps of visual space

McGraw, Paul V.; Roach, Neil W.; Badcock, David R.; Whitaker, David

Authors

Paul V. McGraw

Neil W. Roach

David R. Badcock

David Whitaker



Abstract

In order to interact with our environment, the human brain constructs maps of visual space. The orderly mapping of external space across the retinal surface, termed retinotopy, is maintained at subsequent levels of visual cortical processing and underpins our capacity to make precise and reliable judgments about the relative location of objects around us. While these maps, at least in the visual system, support high precision judgments about the relative location of objects, they are prone to significant perceptual distortion. Here, we ask observers to estimate the separation of two visual stimuliVa spatial interval
discrimination task. We show that large stimulus sizes require much greater separation in order to be perceived as having the same separation as small stimulus sizes. The relationship is linear, task independent, and unrelated to the perceived position of object edges. We also show that this type of spatial distortion is not restricted to the object itself but can also be revealed by changing the spatial scale of the background, while object size remains constant. These results indicate that fundamental spatial properties, such as retinal image size or the scale at which an object is analyzed, exert a marked influence on spatial coding.

Journal Article Type Article
Publication Date Jan 1, 2012
Journal Journal of Vision
Electronic ISSN 1534-7362
Publisher Association for Research in Vision and Ophthalmology
Peer Reviewed Peer Reviewed
Volume 12
Issue 4
APA6 Citation McGraw, P. V., Roach, N. W., Badcock, D. R., & Whitaker, D. (2012). Size-induced distortions in perceptual maps of visual space. Journal of Vision, 12(4), doi:10.1167/12.4.8
DOI https://doi.org/10.1167/12.4.8
Publisher URL http://www.journalofvision.org/content/12/4/8.abstract
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf





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