Differences in global and local level information processing in autism: an fMRI investigation

Area of Science:

• Neuroscience
• Cognitive Psychology
• Developmental Psychology

Background:

• Autism spectrum disorder (ASD) is characterized by atypical visual perception, particularly in processing global and local information.
• Prior neuroimaging studies have focused on local attention in ASD, with limited research on both global and local attention processing.

Purpose of the Study:

• To investigate the neurobiological underpinnings of global and local information processing in adults with ASD using functional magnetic resonance imaging (fMRI).
• To compare brain activation patterns between individuals with ASD and typically developing (TD) individuals during a hierarchical visual task.

Main Methods:

• Functional magnetic resonance imaging (fMRI) was employed with 17 adults with ASD and 16 TD adults.
• Participants completed an abstract hierarchical design task assessing attention to global and local visual features.

Main Results:

• No brain regions showed increased activation in TD subjects compared to ASD subjects.
• ASD subjects exhibited greater activation in the right superior frontal gyrus during locally directed attention.
• ASD subjects showed greater right lateral occipital activation during globally directed attention and less deactivation in the medial prefrontal cortex (default mode network).

Conclusions:

• The study elucidates distinct neural networks associated with atypical global and local feature processing in ASD.
• Findings highlight specific regional brain differences in attention and visual processing in individuals with autism spectrum disorder.