How do psychological factors contribute to altruistic behavior?
Psychologically, people often engage in acts that benefit others at a personal cost, which cannot be fully explained by kin selection or reciprocal altruism. Such behaviors include donations to strangers or emergency responses to risks, suggesting that our neurobiological reward systems have adapted to derive pleasure from the welfare of others.
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This is one answer. The complete system — the psychology, the biology, and the method — is in the book.
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