Ive also read some out of wack theories like some conditions like autism could come from them since its more prevalent on white people. This would explain that a group that engages more socially creating bonds and more complex societal tribes in number would outnumber and extinguish these weird less verbal humans
It's far from conclusive, not representative of the majority of folks with autism diagnoses, and needs more replication and investigation. But it could be a thing. Speaking as a spectrum-y red-haired middle-european.
