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Describe and evaluate how neural and hormonal mechanisms influence aggressive
behaviour (24 marks)

Neurotransmitters are chemicals that allow impulses within the brain to be transmitted from one area
of the brain to another. The main neurotransmitter believed to play an important role in aggression is
low levels of serotonin.


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Alternatively, hormonal mechanisms also have an important role in influencing aggression.
The hormone testosterone is thought to increase aggression in adults due to its action on brain areas
involved controlling aggression.
For example, research by Dabbs found that criminals with the highest levels of testosterone tended
to have a history…


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