This video comes from researchers investigating how toddlers learn to control their behaviour based on how adults act.

The study, published in Cognitive Development was flagged up by the Science of Us and found toddlers could detect anger and use that information to guide their own behaviour even before being able to speak.

Lead author Betty Repacholi of the University of Washington said: "In this study we found that toddlers, who are not yet speaking, can use visual and social cues to understand other people."

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