Observing friendly social interactions makes people feel good and, as a result, act in an affiliative way towards others. Positive visual contagion of this kind is common in humans but whether it occurs in animals is unknown. A new study has now found a similar effect in macaques.

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Observing friendly social interactions makes people feel good and, as a result, act in an affiliative way towards others. Positive visual contagion of this kind is common in humans but whether it occurs in animals is unknown. A new study has now found a similar effect in macaques.