Researchers say people can spot whether a complete stranger has a certain “social gene” in just 20 seconds.
Two variants of the “oxytocin receptor gene” have been linked with social traits.
People judging the empathy of strangers - by studying the way they listened to people - predicted the genetic variant, a University of Toronto study showed.
The hormone oxytocin has a role in birth, production of milk and bonding between mother and baby.
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