Individuals with autism spectrum disorder have altered visual encoding capacity.

Area of Science:

• Neuroscience
• Cognitive Science
• Developmental Psychology

Background:

• Autism spectrum disorder (ASD) is associated with perceptual anomalies.
• These anomalies are often linked to altered sensory evidence weighting and prior knowledge integration.
• Previous research suggests differences in how individuals with ASD process sensory information.

Purpose of the Study:

• To investigate differences in sensory encoding and adaptation to changing stimulus statistics between neurotypical and ASD groups.
• To determine if individuals with ASD exhibit distinct patterns of sensory representation and capacity.
• To explore the relationship between initial encoding capacity and adaptation to novel sensory environments.

Main Methods:

• Utilized a visual orientation estimation task to assess psychophysical data.
• Employed an information theoretic measure to quantify the accuracy of sensory encoding.
• Exposed participants to natural scene statistics followed by an artificial, uniform distribution of visual orientations with performance feedback.

Main Results:

• Sensory representations initially reflected natural scene statistics in both groups, but with lower encoding capacity in the ASD group.
• Neurotypical individuals adapted their sensory representations to the novel statistics, increasing encoding capacity.
• Individuals with ASD showed no significant changes in total encoding capacity or its allocation, indicating limited adaptation.
• Adaptation levels correlated with initial encoding capacity across both groups.

Conclusions:

• Individuals with autism spectrum disorder exhibit significant deficits in sensory encoding.
• These deficits are independent of and potentially additive to decoding deficits.
• Sensory adaptation to changing environmental statistics is impaired in ASD.
• Findings suggest fundamental differences in how sensory information is processed and updated in ASD.