What convincing evidence is there that autism spectrum disorder involves some form of brain damage?

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Studies have shown that individuals with autism spectrum disorder often exhibit brain abnormalities, including abnormal neural connectivity and structural differences in certain regions of the brain. Additionally, a significant portion of individuals with autism spectrum disorder also have some level of intellectual disability, further suggesting some form of brain dysfunction or damage. However, there is no evidence to support the idea that most children with autism spectrum disorder suffered some form of brain trauma at birth, and the fact that autism runs in families suggests a genetic component rather than brain damage. The fact that autism develops fairly quickly and at a young age is not necessarily evidence of brain damage, as there are many possible explanations for the onset of autism symptoms.

What Convincing Evidence Is There That Autism Spectrum Disorder Involves