October 2020
Volume 20, Issue 11
Open Access
Vision Sciences Society Annual Meeting Abstract  |   October 2020
Reduced Functional Dissociation Between Action and Perception in Individuals with Autism
Author Affiliations & Notes
  • Zoha Ahmad
    Centre for Vision Research, York University
  • Nahal Binur
    Department of Special Education and Edmond J. Safra Brain Research Center, University of Haifa
  • Tzvi Ganel
    Department of Psychology and Zlotowski Center for Neuroscience, Ben-Gurion University of the Negev
  • Bat-Sheva Hadad
    Department of Special Education and Edmond J. Safra Brain Research Center, University of Haifa
  • Erez Freud
    Centre for Vision Research, York University
  • Footnotes
    Acknowledgements  This research was funded by Natural Sciences and Engineering Research Council of Canada (NSERC) (EF) and by the Vision Science to Applications (VISTA) program funded by the Canada First Research Excellence Fund (CFREF, 2016–2023) (EF)
Journal of Vision October 2020, Vol.20, 1238. doi:https://doi.org/10.1167/jov.20.11.1238
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      Zoha Ahmad, Nahal Binur, Tzvi Ganel, Bat-Sheva Hadad, Erez Freud; Reduced Functional Dissociation Between Action and Perception in Individuals with Autism. Journal of Vision 2020;20(11):1238. doi: https://doi.org/10.1167/jov.20.11.1238.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Perceptual changes are a widely acknowledged but poorly understood feature of autism. One hypothesis is that those changes are the result of reduced cortical specialization. Here, we sought to examine this hypothesis by exploiting the well-established functional dissociation between the ventral pathway that mediates vision-for-perception, and the dorsal pathway that mediates vision-for-action. We predicted that a reduced cortical specialization would lead to atypical intrusions of perceptual effects in action. To this end, we examined the effect of the Ponzo Illusion on perception and action in a group of typically developed adults and individuals with autism. Two objects that differ in their real size were placed on the illusory background such that there was a conflict between the real size and the perceived size of the objects. In each trial, participants made perceptual size discriminations and then grasped one of the objects based on its perceived size. Consistent with previous results, the maximum grip apertures (MGA) of the typically developed participants were scaled to the real size of the object, even in trials in which their overt perceptual decisions were deceived by the illusion. This, however, was not the case for individuals with autism. In particular, for this group, the MGA were not scaled to the real size of the objects when perceptual decisions were incorrect. These results provide novel evidence for a reduced functional dissociation between perception and action in individuals with autism.

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