Princeton study suggests that monkeys, like humans, may have ‘self-domesticated’

Ever since Darwin’s time, some scientists have speculated that humans “self-domesticated” — that we chose less aggressive and more helpful partners, with the result that we have shifted the trajectory of our own evolution. “The evidence for this has been largely circumstantial,” said Asif Ghazanfar, a professor of psychology and neuroscience. “It’s really a popular and exciting idea but one that lacks direct evidence, a link between friendly behavior and other features of domestication.”