The fact that monkeys who are lower in the dominance hierarchy of their group will not attack monkeys who are higher in the hierarchy, even when their brain is stimulated, suggests that:

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The fact that monkeys' aggressive behavior is modified by their social hierarchy indicates that aggression is heavily influenced by social learning rather than being solely innately determined or solely learned since our earliest evolutionary times. This also suggests that human aggression, which is similarly influenced by social factors, can be traced back to lower primates.

The Fact That Monkeys Who Are Lower in the Dominance