A good example of Humans being selected for less intelligence are "hobbits" who had chimp sized brains: https://en.m.wikipedia.org/wiki/Homo_floresiensis https

A good example of Humans being selected for less intelligence are "hobbits" who had chimp sized brains: https://en.m.wikipedia.org/wiki/Homo_floresiensis https://en.m.wikipedia.org/wiki/Homo_floresiensis