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Debras and Jaeggi study oxytocin in group competition with Tsimane’ in Bolivian Amazon; OT rises against familiar rivals; men rise more. Oxytocin Linked to Group Competition | | UZH Oxytocin Linked to Group Competition Oxytocin – often referred to as the “love hormone” – also plays a role in competitions between groups, a new study led by Charlotte Debras and Adrian Jaeggi from UZH’s Institute of Evolutionary Medicine shows. “Previous work showed that receiving oxytocin via a nasal spray can make people more ‘groupish’,” says Debras, who conducted the study as part of her doctoral research. “But it wasn’t known whether OT naturally increased during group competition.” ...