By Randolph Nesse, MD. Thanks to Rob Henderson
Crespi has assembled evidence that excess dominance of paternal alleles may increase the risk of autism, while excess unopposed activity of maternal alleles may increase the risk of schizophrenia. This hypothesis predicts that babies born a bit heavier than average will have an increased risk of autism, and those born a bit lighter than average will have an increased risk of schizophrenia. Remarkably, a study of millions of people in Denmark confirmed the prediction.
Simon Baron-Cohen's theory that autism is a sort of "extremely male" brain is mentioned but not discussed much. As I had been thinking about him last week but forgotten him, it was good to get the reminder.
More recently, he has been amassing evidence that invention is linked to autism.