The frontal cortex is an incredibly interesting part of the brain - ours is proportionately bigger and/or more complex than in any other species.
Robert M. SapolskyNaturally, things are more complicated - those groovy, pro-social effects of oxytocin apply to how we interact with in-group members.
Robert M. SapolskyBrains distinguish between an Us and a Them in a fraction of a second. Subliminal processing of a Them activates the amygdala and insular cortex, brain regions that are all about fear, anxiety, aggression, and disgust.
Robert M. Sapolsky