We have noted that genes resulting in high dopamine are associated with autism and schizophrenia. These genes interface with candidate genes in NPA theory where low COMT gene or low DBH gene seem associated with A- trait .
Here additionally an environmental cause, the increase in use of the herbicide ROUND UP is hypothesize to cause increasing autism in population. Not clear that an environmental cause is necessary to understand increase in autism given the increase in social partitioning of society, i.e. high tech oriented individuals mating with other high tech oriented individuals producing higher probability of children with autism.
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