Rejection massively reduces IQ

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Rejection can dramatically reduce a person's IQ and their ability to reason analytically, while increasing their aggression, according to new research.

Aggression scores increased in the rejected groups. But the IQ scores also immediately dropped by about 25 per cent, and their analytical reasoning scores dropped by 30 per cent.

"These are very big effects - the biggest I've got in 25 years of research," says Baumeister. "This tells us a lot about human nature. People really seem designed to get along with others, and when you're excluded, this has significant effects."

Baumeister thinks rejection interferes with a person's self-control. "To live in society, people have to have an inner mechanism that regulates their behaviour. Rejection defeats the purpose of this, and people become impulsive and self-destructive. You have to use self-control to analyse a problem in an IQ test, for example - and instead, you behave impulsively."

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