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Visual Agnosia

Visual Agnosia

Visual agnosia is a condition characterized by the inability to recognize visually presented objects despite having normal vision. For instance, a person with visual agnosia can describe the shape and color of an object but cannot identify or name it. This impairment does not affect their visual field, acuity, color vision, brightness discrimination, language, or memory. An example of this condition in a social setting is someone at a dinner party asking for "that silver thing with a round...

Autism Spectrum Disorder

Autism Spectrum Disorder

Autism spectrum disorder (ASD) is a neurodevelopmental condition marked by persistent deficits in social communication and interaction alongside restrictive and repetitive behaviors or interests. ASD is sometimes accompanied by intellectual impairment.
These core symptoms manifest differently among individuals, ranging from mild to severe. The disorder's complexity extends beyond its clinical presentation, encompassing a diverse range of biological, cognitive, and sociocultural influences.

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Related Experiment Video

Updated: Jun 16, 2025

Comparing Eye-tracking Data of Children with High-functioning ASD, Comorbid ADHD, and of a Control Watching Social Videos

Comparing Eye-tracking Data of Children with High-functioning ASD, Comorbid ADHD, and of a Control Watching Social Videos

Published on: December 7, 2018

Intact Susceptibility to Visual Illusions in Autistic Individuals.

Yarden Mazuz¹, Bat-Sheva Hadad², Tzvi Ganel¹

¹Department of Psychology, Ben-Gurion University of the Negev, Beer-Sheva, Israel.

Autism Research : Official Journal of the International Society for Autism Research

|April 22, 2025

Summary

This summary is machine-generated.

Autistic individuals show typical susceptibility to size illusions, challenging theories of reduced prior information use. This study indicates autistic people effectively use long-term knowledge in perception.

Keywords:

Autism Perceptual priors Size discrimination Size perception Visual Illusions

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Last Updated: Jun 16, 2025

Comparing Eye-tracking Data of Children with High-functioning ASD, Comorbid ADHD, and of a Control Watching Social Videos

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Published on: December 7, 2018

Eye Tracking Young Children with Autism

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Published on: March 27, 2012

Testing Sensory and Multisensory Function in Children with Autism Spectrum Disorder

Testing Sensory and Multisensory Function in Children with Autism Spectrum Disorder

Published on: April 22, 2015

Area of Science:

Neuroscience
Cognitive Psychology
Autism Research

Background:

Autism is characterized by altered sensory perception, often linked to reduced use of contextual or prior information.
Previous studies on autistic perception and illusions have yielded inconsistent results.
Reduced susceptibility to perceptual illusions has been proposed as evidence for atypical sensory processing in autism.

Purpose of the Study:

To systematically investigate susceptibility to size illusions in autistic and non-autistic individuals.
To challenge existing theories by examining the role of prior information in autistic perception.
To provide robust psychophysical evidence on autistic perception of size illusions.

Main Methods:

Utilized a standardized psychophysical battery, the Ben-Gurion University Test for Perceptual Illusions (BTPI).
Assessed 81 participants (41 autistic, 40 non-autistic) on susceptibility to Ponzo, Ebbinghaus, and Height-width illusions.
Measured illusion magnitude and perceptual resolution (discrimination thresholds).

Main Results:

Both autistic and non-autistic groups demonstrated clear susceptibility to size illusions.
No significant group differences were found in illusion magnitude or discrimination thresholds.
Results were consistent across all tested illusory settings.

Conclusions:

Challenges theories suggesting reduced reliance on priors or enhanced sensory measurement in autism.
Provides strong evidence that autistic individuals form priors and utilize long-term knowledge in perception.
Highlights the importance of robust psychophysical methods in understanding autistic perception.