‘Love hormone` may make monkeys a little kind

"Love hormone” that builds mother-baby bonds may make brusque monkeys treat each other a little more kindly, a new study has found.

Washington: The “love hormone” that builds mother-baby bonds and may help an individual feel more connected towards one another, can also make brusque monkeys treat each other a little more kindly, a new study has found.

Administering oxytocin nasally through a kid-sized nebulizer, like a gas mask, a Duke University research team has shown that it can make rhesus macaques pay more attention to each other and make choices that give another monkey a squirt of fruit juice, even when they don’t get one themselves.

Two macaques were seated next to each other and trained to select symbols from a screen that represented giving a rewarding squirt of juice to one’s self, giving juice to the neighbour, or not handing out any juice at all.

In repeated trials, they were faced with a choice between just two of these options at a time – reward to self vs. no reward, reward to self vs. reward to other, and reward to other vs. no reward.

“The inhaled oxytocin enhanced ‘prosocial’ choices by the monkeys, perhaps by making them pay more attention to the other individual,” Michael Platt, the study leader from the Duke Institute for Brain Sciences, said.

“If that’s true, it’s really cool, because it suggests that oxytocin breaks down normal social barriers,” he added.

Earlier work by Platt’s group had shown that macaques would rather give a reward to another monkey when the alternative is no reward for anyone, a concept they call “vicarious reinforcement”.

Their data in the latest study show an apparent improvement in vicarious reinforcement about a half-hour after exposure to oxytocin. Interestingly, for the first half-hour, the monkey was more likely to reward itself.


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