August 2012
Volume 12, Issue 9
Free
Vision Sciences Society Annual Meeting Abstract  |   August 2012
Brightness local bias in children with autism spectrum disorder
Author Affiliations
  • Simone Gori
    Developmental and Cognitive Neuroscience Lab, Department of General Psychology, University of Padua, Italy\n“E. Medea” Research Hospital, Bosisio Parini (LC), Italy
  • Luca Ronconi
    Developmental and Cognitive Neuroscience Lab, Department of General Psychology, University of Padua, Italy
  • Francesca Abalti
    Developmental and Cognitive Neuroscience Lab, Department of General Psychology, University of Padua, Italy
  • Massimo Molteni
    “E. Medea” Research Hospital, Bosisio Parini (LC), Italy
  • Tiziano Agostini
    Department of Psychology, University of Trieste, Italy
  • Andrea Facoetti
    Developmental and Cognitive Neuroscience Lab, Department of General Psychology, University of Padua, Italy\n“E. Medea” Research Hospital, Bosisio Parini (LC), Italy
Journal of Vision August 2012, Vol.12, 793. doi:10.1167/12.9.793
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    • Get Citation

      Simone Gori, Luca Ronconi, Francesca Abalti, Massimo Molteni, Tiziano Agostini, Andrea Facoetti; Brightness local bias in children with autism spectrum disorder. Journal of Vision 2012;12(9):793. doi: 10.1167/12.9.793.

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

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Abstract

Autism spectrum disorder (ASD) has long been associated with a detail-oriented visual perception. Local-perceptual bias might be partially responsible also to the "core" deficits in the social domain, such as face processing and biological motion detection. There is a large literature describing this "local-perceptual bias" in ASD, which results, sometimes, in superior performances compared to typically developing (TD) children. However nothing is known about the lightness-perception (brightness) in children with ASD. We investigated the lightness-perception in 21 children, 11 TD and 10 children with ASD matched for age and IQ. Lightness-induction can occur on the basis of the immediate surround of a region (local interactions) and also on the basis of global factors of perceptual organization. We employed a stimulus set proved to differentiate the contributions of these two factors. In TD adults, according to the literature, when higher-level and lower-level factors act contemporaneously, the contrast effect induced by the global-organization principle of perceptual belongingness overcomes the local effect due to retinal lateral inhibition. In the Experiment 1, a grey scale matching task, the TD children confirmed the results obtained with adults: the brightness was a consequence of the global factors. On the contrary the children with ASD completely ignored the global information provided by the display. In the Experiment 2, we "simulate" the lightness-perception of the ASD children varying the time exposure of the stimulus in TD university students. The result was that the TD students’ brightness was comparable to what observed in the children with ASD when visual stimulus was masked after 150 ms, suggesting that brightness processing in ASD is restricted to the low-level visual areas . In conclusion also the lightness perception in children with ASD is peculiar: a local bias affects their final percept and it could have consequences in their high-level social-communicative development.

Meeting abstract presented at VSS 2012

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