How to synchronise heart beats

It’s not always easy to follow your heart. But for human babies and their mothers, following each other’s hearts may be as simple as sharing a smile.

A new study shows that 3-month-old infants and their mothers can synchronize their heartbeats to mere milliseconds. Researchers sat 40 pairs of mothers and infants face-to-face, equipped with sticky skin electrodes on either side of their hearts. Beat for beat, mother-and-child hearts thumped together almost instantly as they shared loving looks or contented coos. This cardiac coupling worked only for moms with their own babies, and only when the duos synchronized smiles and other cheerful social behaviours. Learn more here.

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