Autism is a good lead to try to understand human behavior. Here we see some maps of vitamin D deficiency. And we see an article where Vit D was lower in those with autism.
The map may say something about polymorphic habitancies as these regions seem to have less vitamin D deficiency.
This is not to oversimplify and say that Vitamin D deficiency causes autism, but it may be one of a limited set of genetics effects that characterize individuals with less autonomic nervous system activity.
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