Prejudice Reveals the Caveman in Us

Like their cavemen ancestors who fought outsiders for land and potential mates, the modern guy still holds such prejudices against "outgroups," new research shows.

Whereas men's prejudicial views towards outgroup males are often motivated by aggression, women's biases stem from fear, and these different psychologies evolved from our history of group conflict, the researchers said.

That's the basic premise of the so-called "male warrior hypothesis," formulated by Carlos Navarrete, a psychologist at Michigan State University, and his colleagues. To come to their conclusions, the researchers analyzed the breadth of social science literature on intergroup biases, group conflict and sexual selection....