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Scandinavians are under strong selective pressure to keep schizophrenia low, but their high consumption of fish both reduces the power of that pressure and redirects it away from acting directly upon schiz causing alleles and instead improving omega-3 metabolism instead.
The population that has probably been under the most ruthless selection again schiz per se are the Finns, who along with their Estonian cousins have the highest PISA scores in Europe. Pfiffer also calculated them as having highest the Edu Attainment PGS of any Europeans.
Schizophrenia risk increases with every IQ dropped and the same genes that increase schiz risk also impair mental function in normals:https://www.nature.com/articles/s41380-018-0332-x …
Selection against nuttiness may also help to explain the distinctive Nordic personality: in other words, why they’re so boring. The positives to being sane are obvious; the downsides are that you find yourself living in a country where people stare at a burning log on Christmas.
There's a lot more to write about this, but these are the big points. In my next dealie I'm going to try to figure out what changed around 1985 that led to the current autism explosion and explain how it affected even non-autistic millenials.
Finns and Estonians do not score higher than Swedes, Danes, Germans in PISA if you exclude immigrants (you can do that in PISA database)
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