Sackett (1996- found that as a baby monkey matured they respond to threatening stimuli.
Contradictory evidence
Nisbett (1993)- In the USA murder triggered by arguments is more common in white males in southern states than in northern, due to a ‘culture of honour’.
Other explanations
Social learning theory
Issues with generalising FAP/IRM to humans
Cannot be sure of the validity of using ethology to explain aggression.
Aggressive response is not universal
In the same situation, some people will react aggressively and others will not.
