Uncovering the Social Deficits in the Autistic Brain. A Source-Based Morphometric Study

Area of Science:

• Neuroscience
• Developmental Psychology
• Radiology

Background:

• Autism is a neurodevelopmental disorder impacting social interaction and communication.
• Functional MRI studies suggest social brain structures are key in autism, but anatomical findings are inconsistent.
• Investigating patterns of gray matter covariance in autism may reveal underlying structural abnormalities.

Purpose of the Study:

• To identify unique gray matter concentration patterns in specific brain regions affected in autism.
• To explore the relationship between structural brain differences and autistic symptomatology.

Main Methods:

• Structural MRI scans from 32 young men with autistic disorder (AD) and 50 age-, sex-, and handedness-matched controls were analyzed.
• Multivariate Source-Based Morphometry (SBM) was employed to detect independent gray matter networks.
• Autism Diagnostic Observation Schedule (ADOS) scores were used to quantify social and behavioral deficits.

Main Results:

• A significant difference in a gray matter network was identified between individuals with AD and controls.
• This network encompasses temporal regions (social cognition, visual processing) and frontal areas (motor, executive functions).
• Gray matter differences detected by SBM correlated significantly with ADOS scores, indicating a link to social and behavioral deficits.

Conclusions:

• Source-Based Morphometry revealed distinct gray matter covariance patterns in individuals with autism.
• These structural differences are associated with key brain regions involved in social cognition and processing.
• Findings support the role of atypical neural mechanisms in the social and mental state processing deficits observed in autism.