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Serotonin
There is a link between low levels of serotonin
and aggression.
Mann et al- Ps given drug that lowers
serotonin increase score on aggression
questionnaire by males
Raleigh- Monkey's fed either serotonin
reducing or increasing diet. Monkey fed
reducing diet more aggressive.
Popova- Animals bred for docile
domestication have increased serotonin.…read more

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Man et al.
AO1
35 Ps given a serotonin lowering drug.
Aggression tested using an aggression
questionnaire...increased score in males only.
Supports the claim that low serotonin increases
aggression.
AO2
People may have lied on questionnaire which may
explain the difference in gender scores...males may
want to appear more masculine.
Higher aggression score may be explained by side
effects of the drugs which may have caused aggression.…read more

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Raleigh
AO1
Monkeys fed either serotonin reducing diet or
serotonin increasing diet.
Monkey fed serotonin reducing showed more
aggression.
Supports claim that low serotonin increases
aggression.
AO2
Cannot fully generalise results from animal
studies to humans as humans a lot more
complex.…read more

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Popova
AO1
Animals bred for docile domestication
have increased serotonin.
Supports link between aggression and
serotonin.
AO2
Supports evolutionary idea because the
serotonin has adapted to fit their purpose.
Implications of animal research.…read more

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Depression and
Aggression
· Also an association between depression
and low levels of serotonin, and anti-
depressants are shown to raise the levels
of serotonin making them less aggressive.
· Hard to establish cause + effect are
people with depression aggressive
because they have low levels of serotonin
or are they aggressive because they have
depression.…read more

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