In an attempt to debunk the myth that aggression is instinctual,biologist Zing Yang Kuo (1961)raised a kitten in the same cage with a rat.Not only did the cat refrain from killing the rat,but the two became quite close companions.This experiments demonstrated that

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Kuo's experiment demonstrated that the aggressive instinct can be inhibited by early experience, suggesting that aggression is not purely instinctual. The specific nature of the inhibition (i.e. towards rats but not other animals) also suggests that learning and discrimination play a role in regulating aggression. However, it cannot be concluded that aggression is never instinctual, as Kuo's experiment only pertains to one specific context and species.

In an Attempt to Debunk the Myth That Aggression Is