Study Finds Autism-Related Brain Excitation-Inhibition Imbalances Vary by Region and Age
A large neuroimaging study of 172 individuals found that autism spectrum disorder is associated with altered cortical excitation-inhibition balance, but only in specific brain regions and at particular developmental stages rather than globally. The research used magnetoencephalography to track these patterns across childhood, adolescence, and adulthood in both autistic and typically developing individuals. The findings suggest that autism's neural basis involves region-specific and age-dependent differences rather than a uniform brain-wide imbalance, which may help explain why autism presents differently across individuals.
Researchers examined cortical excitation-inhibition (EI) balance in 92 typically developing individuals and 80 autistic individuals aged 6-32 using resting-state magnetoencephalography. The study found that while broad topographic patterns of EI balance were similar between groups overall, significant differences emerged when data were analyzed by age group and brain region. In childhood, autistic individuals showed increased global EI balance; in adolescence, decreased balance; and in adulthood, no significant group differences. Region-specific analyses identified persistent differences in the right dorsolateral prefrontal cortex and diverging developmental trajectories in the left inferior parietal cortex. The research supports a model in which autism-related EI imbalances are not uniformly distributed across the brain but instead manifest through specific regional and developmental patterns, potentially explaining the heterogeneity of autism presentations.
What's missing
The study's limitations regarding generalizability (e.g., sample demographics, geographic representation), the specific clinical characteristics and comorbidities of the ASD sample, and whether findings replicate across different neuroimaging modalities are not detailed in the abstract provided.
What different sources said
- bioRxivCenter
Cortical Excitation-Inhibition Balance in Autism Varies by Brain Region and Age
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