(Phys.org) —That Homo sapiens exhibits both cooperative and competitive behavior is a topic that continues to be the subject of ongoing discussion. In terms of cooperation, altruism (a selfless type of prosocial behavior in which an organism acts to benefit another at a cost to itself), has received significant attention from evolutionary biologists, neuroscientists, economists, psychologists, philosophers, social scientists, game theorists, and computer scientists. In particular, altruistic punishment – in which individuals who, at no apparent benefit (or even at a cost) to themselves, punish someone who has treated another unfairly – has been demonstrated in a range of studies. Recently, however, scientists at the University of Miami posited that the evidence for these results is possibly affected by experimental artifacts, and is therefore questionable. To address their hypothesis, the researchers designed and performed an experiment without such artifacts, finding that while victims punished offenders, witnesses did not – and moreover reacted with envy for ill-gotten gains rather than moralistic anger. In addition, a second experiment showed that previous evidence was due to what is known as affective forecasting error (inaccurate estimations of reactions to hypothetical situations). The scientists concluded that evidence supporting human altruistic punishment has been overstated.
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