There are no real outward physiological giveaways that someone has autism, say like Down Syndrome for example.
Autistic people look like the people who do not have autism, that is until you get to know someone with autism. That is to say, that autism is a developmental disorder, and so the difference is neurologically, not physically.
So, that means that we must look at the brain.
Autism affects things like your ability to function socially, and have control over one’s emotions.
So, it affects things like the amygdala hippocampal circuit, caudate nuclei, the cerebellum, and the frontotemporal regions of the brain.
Also it is hypothesized that the mirror neurons are damaged in someway. And there tends to be abnormalities in the white matter of the brain, compared to that of a “normal brain”.
I hope that helps.
