Oxytocin, the luv hormone, makes us more prosocial to Us and worse to everyone else. That's not generic prosociality. That's ethnocentrism and xenophobia. In other words, the actions of these neuropeptides depend dramatically on context-who you are, your environment, and who that person is.
( Robert M. Sapolsky )
[ Behave: The Biology of Humans ]
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