... hard drugs. The study also revealed that among inmates the ones with higher testosterone levels committed violent crimes, more likely to be rejected for release by the parole board, and had more prison rule violations (Dabbs Jr., 1995). There are two other biological factors that may play a role in the prevalence of aggressive behaviour. One of these is a brain chemical called Serotonin. Serotonin sometimes acts as a behavioural inhibitor. People that have a lower level of serotonin often show increased levels of impulsivity and aggressiveness. They are not as self-conscious about their behaviours so they act on pure instinct more than others. Another chemical in the brain, dopamine, is also believed to contribute to aggressive behaviour (Retzinger, 1991). Another cause of aggressive behaviour is believed to come in early childhood. If a child is abused or sees abuse occur, they are more likely to be abusive in their ...

See this essay or coursework document in full right now