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Oxytocin, known as the "love hormone," is key in emotions such as attraction, trust, and bonding. It helps with labor contractions, milk production during breastfeeding, and sexual arousal.

Oxytocin, this research seemed to suggest, makes people feel warmer and fuzzier to those they consider “us.” But it makes people crappier to the “thems. ...

With the added edge of oxytocin, they could "tip the balances a little," says Larry Young, a researcher who studies the hormone at Emory University near Atlanta.

Oxytocin is a real hormone, a neuropeptide, that has been shown to influence behavior across the animal kingdom, particularly in mammals, and particularly in social mammals.

But the players on oxytocin said they made the right prediction 79.7% of the time, as did 66.7% of the players on the placebo. What’s more, ...

Since the hormone oxytocin makes people more social, it's easy to imagine it might cause the social deficits of autism. But a study found children with autism no more likely to be short of oxytocin.