Mental Illness & Autism is known for being more common in people of Northern European descent, the reason is due to Neanderthal DNA, Northern Europeans have the highest amount of Neanderthal DNA within Homo sapiens, the crossing of Proto-Caucasoids & Neanderthals, which created the Cro-Magnid, created a mutation which lead to many people of Northern European Cro-Magnon ancestry having Psychological issues, according to FamilyTreeDNA, I'm a quarter Northern European (from the Celts in Spain), & I have Bipolar Disorder & Asperger's Syndrome, & I have noticed that here in California, it's more common in people with Northern European ancestry.
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