#Parochialaltruism

Recent scientific research has illuminated a profound truth about how stress influences human social behavior: While stress may foster unity and generosity among members of the same group, it simultaneously stirs up aggression and suspicion toward those outside the group. These insights, highlighted in a July 2025 report by Psychology Today, draw from a study published in the Proceedings of the National Academy of Sciences (PNAS) and have far-reaching implications for societal cohesion, especially in rapidly changing societies like Thailand.