There might be an incident where normally functioning humans are born with some of the cognitive advantages of autism.
Strangely enough this has already happened. There is a guy that I saw on a discovery show about autistic people I think, he's autistic but he's fully functional in society. He looks, talks, acts, exactly like normal human beings. But he's a natural genius. That's about all the info I have on that though, as I don't remember where he lives or what his name is.