“People really seem designed to get along with others, and when you’re excluded, this has significant effects.” Rejection can dramatically reduce a person’s IQ and their ability to reason analytically, while increasing their aggression, according to new research.

“It’s been known for a long time that rejected kids tend to be more violent and aggressive,” says Roy Baumeister of the Case Western Reserve University in Ohio, who led the work. “But we’ve found that randomly assigning students to rejection experiences can lower their IQ scores and make them aggressive.” New Scientist