Differential neural correlates underlying visuospatial versus semantic reasoning in autistic children

Area of Science:

• Neuroscience
• Developmental Psychology
• Cognitive Science

Background:

• Autism Spectrum Disorder (ASD) is often associated with fronto-posterior underconnectivity.
• Previous research suggests task context can influence observed functional connectivity differences between autistic and neurotypical individuals.

Purpose of the Study:

• To investigate how different task paradigms (visuospatial vs. semantic reasoning) and complexities modulate functional connectivity in young autistic children compared to typically developing children.
• To explore the nuanced nature of brain connectivity alterations in autism.

Main Methods:

• Functional magnetic resonance imaging (fMRI) was used to scan 23 autistic and 23 typically developing children (aged 6-15 years).
• Participants completed reasoning tasks with visuospatial and semantic content, varying in complexity.
• Between-group differences in functional connectivity were analyzed as a function of task type and complexity.

Main Results:

• No significant differences in functional connectivity were found for semantic reasoning tasks.
• Autistic children exhibited occipital-occipital, occipital-temporal, and occipital-frontal over-connectivity during visuospatial reasoning tasks compared to controls.
• Increased visuospatial task complexity led to greater functional connectivity in occipital, temporal, and frontal regions in autistic participants.

Conclusions:

• Functional connectivity alterations in autism are more complex than previously assumed and are modulated by task type and complexity.
• Visuospatial processing, particularly with increasing complexity, reveals distinct connectivity patterns in autistic children.
• These findings underscore the importance of considering cognitive context when studying brain differences in autism.