Individual differences in symptom severity and behavior predict neural activation during face processing in...

Area of Science:

• Neuroscience
• Developmental Psychology
• Autism Spectrum Disorder Research

Background:

• Atypical neural activation in autism is documented in visual processing, but its extension to affective regions and relation to symptoms is unclear.
• Understanding these neural differences is crucial for addressing social deficits in autism spectrum disorder (ASD).

Purpose of the Study:

• To investigate face-, object-, and house-related brain activation in adolescents with high-functioning autism (HFA) compared to typically developing (TD) controls.
• To examine the relationship between neural activation patterns, autism symptom severity, and face recognition abilities.

Main Methods:

• Functional magnetic resonance imaging (fMRI) was used to compare brain activity between HFA and TD adolescent males during visual tasks.
• Analyses focused on core visuoperceptual and affective face-processing regions, including the amygdala, posterior cingulate cortex, and anterior temporal lobe.

Main Results:

• HFA adolescents displayed hypo-activation in visuoperceptual regions (especially right hemisphere) and affective regions like the posterior cingulate cortex and right anterior temporal lobe.
• Amygdala activation patterns varied depending on the analytical contrast used.
• Symptom severity correlated with face activation magnitude in the right fusiform gyrus; face recognition performance predicted activation in the right anterior temporal lobe among HFA participants.

Conclusions:

• Findings reveal a systematic link between neural dysfunction magnitude, autism symptom severity, and face recognition variability in adolescents with autism.
• This study uncovers critical brain-behavior relationships underlying social deficits in autism and helps reconcile existing literature discrepancies.