I know that autism affects several brain structures/regions such as the amyglada, frontal lobe, cerebellum, brain stem, and parietal lobe, but how exactly does the brain of someone with a high functioning form of autism differ from someone with a low functioning form of autism? For example, how does Asperger's syndrome affect the brain differently than classic Kanner autism? And even more in depth, how does mild Asperger's syndrome affect the brain as opposed to moderate Asperger's, or even high functioning autism? Are there significant differences or subtle differences in neural connections and or/ratios of grey matter to white matter?