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Severely Attenuated Visual Feedback Processing in Children on the Autism Spectrum.

Emily J Knight1,2, Edward G Freedman3, Evan J Myers3

  • 1Frederick J. and Marion A. Schindler Cognitive Neurophysiology Laboratory, Del Monte Institute for Neuroscience, Department of Neuroscience, University of Rochester School of Medicine and Dentistry, Rochester, New York 14642 EmilyJ_Knight@urmc.rochester.edu john_foxe@urmc.rochester.edu.

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Children with autism show weaker visual feedback processing, impacting their ability to integrate global visual information. This study used electroencephalography (EEG) to reveal differences in how autistic children perceive illusory contours compared to neurotypical children.

Keywords:
autism spectrum disorderillusory contoursobject recognitionvisual evoked potentialsvisual feedback

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Area of Science:

  • Neuroscience
  • Developmental Psychology
  • Autism Spectrum Disorder Research

Background:

  • Autism spectrum disorder (ASD) is associated with atypical sensory perception, potentially due to altered feedback mechanisms in sensory cortices.
  • A proposed mechanism involves an imbalance in higher-order feedback, leading to a focus on local features over global context.
  • Understanding these neural underpinnings is crucial for advancing knowledge of visual processing anomalies in ASD.

Purpose of the Study:

  • To investigate the role of higher-order feedback in visual perception in autistic children.
  • To test the hypothesis that autistic individuals exhibit attenuated evoked responses to illusory contours.

Main Methods:

  • Utilized electroencephalography (EEG) to measure visual evoked potentials in 29 autistic and 31 neurotypical children (aged 7-17).
  • Participants passively viewed Kanizsa figures, designed to elicit contour integration dependent on feedback processing.
  • Stimuli included random orientations and configurations forming illusory squares to assess contour integration.

Main Results:

  • Autistic children demonstrated significantly attenuated automatic contour integration responses in lateral occipital regions compared to neurotypical controls.
  • This suggests a disruption in the feedback mechanisms essential for processing global visual features.

Conclusions:

  • The findings provide experimental evidence for disrupted visual feedback processing in children with autism.
  • Weakened predictive feedback or 'priors' may contribute to the visual processing anomalies observed in ASD.
  • This research advances the understanding of feedback's role in visual perception within the context of autism spectrum disorder.