Ire and punishment: Incidental anger and costly punishment in children, adolescents, and adults

Why do children, adolescents, and adults engage in costly punishment to sanction fairness violations? Two studies investigated the differential impact of incidental anger on the costly punishment of 8-year-olds, 13-year-olds, and adults. Focusing on experimentally manipulated incidental anger allows for a causal investigation as to whether and how anger affects costly punishment in these age groups in addition to other motives such as inequity aversion. Study 1 (N = 210) assessed the effect of incidental anger (vs. a neutral emotion) on second-party punishment, where punishers were direct victims of fairness violations. Study 2 (N = 208) examined third-party punishment, where the punisher was an observer unaffected by the violation. Across ages, incidental anger increased the second-party punishment of unequal offers but not equal offers. Thus, anger seems to play a causal role in the punishment of unfairness when fairness violations are self-relevant. As predicted, adults' third-party punishment of unequal offers was higher in the incidental anger condition than in the neutral emotion condition. Children's third-party punishment of unfairness was not affected by the emotion condition, but incidental anger increased adolescents' third-party punishment across offers. Overall, our data suggest that the association between anger and costly punishment is based on the self-relevance of the violation. In third-party situations, where unfairness does not affect the self, social-cognitive processes that develop well into adulthood, such as emotional appraisals, might be necessary for third parties to engage in costly punishment.