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Rethinking altruistic punishment: New experimental insights

Researchers investigated how people decide to confront or avoid unfair behavior, revealing that avoidance is driven by both not wanting to witness inequality and a desire to avoid confrontation. Even those who tend to avoid unfairness will hand out punishment if forced to observe such behavior.

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Sensitivity to fairness and the gut microbiome

Taking pro- and prebiotics affects levels of altruistic punishment in ultimatum game players. Participants who took supplements were more likely to reject unfair offers, with those having a high Firmicutes-to-Bacteroidetes ratio seeing the greatest changes.

Are we born with a moral compass?

Researchers found that infants can punish antisocial behavior exhibited by a third party, indicating an intrinsic motivation for morality. The study's findings suggest that humans may have acquired behavioral tendencies toward moral behavior during evolution.

Past suffering can affect future praise

A study by the University of Missouri found that people are more likely to praise someone for good deeds if they know the person has also faced suffering earlier in life. This discovery sheds light on how humans process and react to positive behaviors, such as giving praise.

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Children's expectations of ingroup support

A study of toddlers and infants found that they expect group members to punish wrongdoers, indicating early understanding of group norms. This suggests that young children's expectations of indirect punishment are driven by an abstract sense of ingroup support.

Pinpointing punishment

A new study has pinpointed the dorsolateral prefrontal cortex (DLPFC) as a critical brain region responsible for coordinating punishment decisions made by judges and juries. The DLPFC integrates information from other parts of the brain to determine punishment, with disruption leading to reduced punishments for morally responsible agents.

Evolution of 'third party punishment'

A study by University of Maryland researchers predicts that strong social ties and low mobility enable the evolution of third-party punishment. In contexts with high social constraint, responsible punishers can induce cooperation and benefit the community.

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PNAS highlights for the week of April 18 - 22

Happiness has been found to be related to the functioning of key body processes, including lower cortisol levels and healthier cardiovascular systems. Researchers also discovered a Chinese herbal medicine component that can inhibit cancer cell growth.