... violence. Ruston & Others did research in 1986 that shows that there is a genetic basis in aggression. They took aggressive animals and timid animals, and bred like with like and produced vicious and docile strains of animals. This shows that genes play an important part in producing aggression. There are also neurobiological factors involved in aggression. Rather than an instinct for aggression, some psychologists believe what may have evolved is an aggressive capacity wired into the human neuromuscular system. For example, in one study, children who were born blind and deaf still displayed aggressive behaviour, such as foot stamping, teeth clenching, and fist making, even though they have never been exposed to aggression (Eibl-Eibesfeldt, 1977). Hormones are another biological factor which may play a part in aggression, particularly in males. For example, many male animals have to be castrated to curb their aggressive tendencies. This works by reducing the aggressive ...

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