Rhythm and interpersonal synchrony in early social development

@article{Trainor2015RhythmAI,
  title={Rhythm and interpersonal synchrony in early social development},
  author={Laurel J. Trainor and Laura K. Cirelli},
  journal={Annals of the New York Academy of Sciences},
  year={2015},
  volume={1337}
}
Adults who engage in synchronous movement to music later report liking each other better, remembering more about each other, trusting each other more, and are more likely to cooperate with each other compared to adults who engage in asynchronous movements. Although poor motor coordination limits infants’ ability to entrain to a musical beat, they perceive metrical structure in auditory rhythm patterns, their movements are affected by the tempo of music they hear, and if they are bounced by an… 

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TLDR
It is found that 14-month-old infants were more likely to engage in altruistic behavior and help the experimenter after having been bounced to music in synchrony with her, compared to infants who were bounces to music asynchronously with her.

Fourteen-month-old infants use interpersonal synchrony as a cue to direct helpfulness

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Synchronous bouncing acts as a social cue for directing prosociality in 14-month-olds, and has implications for how musical engagement and rhythmic synchrony affect social behaviour very early in development.

Synchronized Drumming Enhances Activity in the Caudate and Facilitates Prosocial Commitment - If the Rhythm Comes Easily

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By showing an overlap in activated areas during synchronized drumming and monetary reward, the findings suggest that interpersonal synchrony is related to the brain's reward system.

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