Psychologists have researched the role of testosterone in aggression by studying animals. Injecting animals with testosterone or removing the testes leads to increased or decreased levels of aggression.
Castrating a male animal lowers its testosterone levels. This makes the animal less aggressive. But if the same animal is then injected with testosterone its aggression is restored to a level similar to that before the castration.
This is strong evidence that testosterone is responsible for aggression. But would we be able to say the same about humans? We would not be able to test this in a psychological study, as it is not ethical to deliberately increase testosterone in men to study aggression levels.
Instead, psychologists use animals, although they are naturally different from humans in many ways, both physically and behaviourally. Aggression in humans is less instinctive than in animals; humans consider the consequences of their actions and are more reasoned in their actions than animals.
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