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The Effects of in-Group Grouping on Brain Processes
Humans seem to be highly pro-social as far as primates go. When we look at what humans look like when they're interacting with each other and have an opportunity to do nice things with each other, a small region of the brain called the nucleus comes up. It's very easy for us to act towards other people in a way that doesn't make use of this human tendency to be pro-social but to act more like a chimpanzee.