Supplement Video # 1: A video clip from the interpersonal movement phase. The infant shown here was in the interpersonal synchrony predictable beats condition.

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Supplement Video # 2: An example of an infant who displays helping behaviour towards the experimenter during the clothespin task, followed by an example of an infant who does not display helping behaviour.

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Supplement Audio # 1: The melody played for infants during the interpersonal movement phase in the predictable beat conditions.

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Supplement Audio # 2: The melody played for infants during the interpersonal movement phase in the unpredictable beat conditions.

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Supplement Stimuli: The GarageBand files for the melody and bounce instruction tracks in the even/uneven beat conditions.

Garage Band Files (zip)