The motives for why human aggression is exhibited.

The argument for nature surrounds the feasible
biological
motives
for why human aggression is exhibited. Aggression may
also have a chemical, hormonal, or genetic foundation
which is why the motives for aggressive behaviour in individuals encompass a
number of hypotheses. The trigger of aggression in the brain is mostly caused
by the frontal lobe and amygdala, both linked to limbic system. The frontal
lobe is involved in regulating behaviour and emotions. If the frontal lobe is
damaged in any way, the person would not be able to control their anger and
will be more likely to show aggressive behaviour. The evidence to confirm this
theory that the brain abnormalities are actually linked to aggression can be
found in the study by Raine et al. (1997). He conducted a study composed of 41
individuals, both males and females, who were convicted of murder using PET
scan. Findings of this research discovered that the murderers had major
differences in brain area compared to non murderers, having less activity in the
left side of the brain and more activity on the right side, where amygdala and
hippocampus are located.

Hormones also play a part of humans’ biological system. Aggressive
and violent behaviour is usually accompanied with lover levels of serotonin and
higher levels of male hormone known as testosterone.  Generally, the male hormone testosterone and
its higher levels in males is the reason why are men more aggressive than
women. Research carried out by Kalat (1998), where men aged 15 to 25 had the
highest levels of testosterone also showed the highest level of aggression and
violence. Female aggression has also been linked to certain hormones. Floody
(1968) reviewed studies
on pre-menstrual syndrome and discovered
proof
to guide
the view that in
this time of hormonal fluctuation women
growth
in irritability and hostility, and also
are much
more likely to commit
a crime.

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