#Parochialaltruism

Stress can pull people together or push outsiders away. A July 2025 study summarized by Psychology Today shows that stress chemicals like cortisol and noradrenaline can lead to generosity within one’s own group while eroding trust toward those outside it.

Research in the Proceedings of the National Academy of Sciences explains this as “parochial altruism.” Under pressure, people cooperate more with family, friends, and shared identities, yet may act against rival groups when resources are scarce. For Thai readers, this dual response resonates amid economic shifts, political change, and public health challenges.

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.