autism in the frontal lobe ?

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a couple of days ago students in my class said that adhd and autism are similar in that their causes lie in the frontal lobe, i cant make up my mind about why i have this feeling it is not correct.

Now im interested to know What is really known about autism in the brain ?.
maybe we can make a sticky on autism research and such.

Although there are more differences in the brain with someone with Childhood Disintegrative Disorder than regular autism (even though I still suspect that CDD is a metabolic disorder or a degenerative genetic disease from the way the symptoms present), the internet basically says that autistic brains are larger post-natally (which accounts for severe autistics' macrocephaly), they have more testosterone in the brain (that could just be something made up by that Baron-Cohen guy, though), and the amygdala may be wired differently (that, I sort of believe it's true; the emotional control level in myself is scarily difficult and tempermental...it rarely works unless I'm only slightly upset).