Aggression refers to any act that is intended to cause pain, suffering, or damage to another person. It includes physical or verbal behavior intended to hurt someone. In laboratory experiments, this might mean delivering electric shocks or saying something likely to hurt another's feelings. Aggression is a basic drive of life and part of the process of survival and evolution.
Aggression in humans is partly genetic, with origins going as far as to our reptilian ancestors, and partly a result of the upbringing. Enhanced levels of aggression in male mice and monkeys have been associated with the hormone monoamine oxidase A, MAO-A. However, studies in macaque and humans showed that its negative effects can usually be compensated by parenting.
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