It's the thought that counts: Helping behavior in infants may be determined by previous interactions

We are usually eager to assist people who have helped us in the past. These reciprocal relationships are an important part of adult interactions and foster cooperation in society. New findings, reported in Psychological Science, a journal of the Association for Psychological Science, suggest that this reciprocal behavior may have early beginnings and can be demonstrated in children as young as 21-months-old.

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