Emotional attribution in high-functioning individuals with autistic spectrum disorder: a functional imaging study

Area of Science:

• Neuroscience
• Developmental Psychology
• Psychiatry

Background:

• Autistic spectrum disorder (ASD) is a neurodevelopmental condition affecting social interaction and communication.
• Individuals with ASD often exhibit differences in processing facial expressions and emotions.
• The role of specific brain regions, including the amygdala, fusiform, and prefrontal cortex, in emotion perception in ASD is not fully understood.

Purpose of the Study:

• To investigate whether brain regions support emotion attribution from facial expressions in high-functioning individuals with ASD.
• To compare emotion attribution expertise and neural activation between individuals with ASD and typically developing controls.
• To determine if reduced fusiform activation in ASD is associated with expertise or the condition itself.

Main Methods:

• Functional magnetic resonance imaging (fMRI) was used to scan 14 males with ASD and 10 controls.
• Participants performed emotion match (perceptual) and emotion label (linguistic) tasks.
• Accuracy, response time, and activation in amygdala, fusiform, and prefrontal regions of interest (ROIs) were measured.

Main Results:

• No significant differences were found between groups in accuracy, response time, or ROI activation for the linguistic task.
• For the perceptual task, the ASD group showed similar accuracy but longer response times and reduced fusiform activation compared to controls.
• Reduced fusiform activation in the perceptual task was not explained by lower expertise in the ASD group.

Conclusions:

• Emotion attribution from facial expressions is task-dependent in high-functioning individuals with ASD.
• Reduced fusiform activation during perceptual emotion processing is associated with ASD, independent of expertise.
• Findings suggest that reduced fusiform activation may be a neural marker for ASD.