Hormones and Neurotransmitters by Daniel Paynter https://padlet.com/daniel_paynter/5ymeqclzqv2f Biological Explaination of Aggression en-us 2016-06-03 11:18:24 UTC 2016-06-06 11:20:11 UTC hello@padlet.com Hormonal mechanisms in aggression william_angel https://padlet.com/daniel_paynter/5ymeqclzqv2f/wish/113773856 2016-06-06 10:48:26 UTC https://padlet.com/daniel_paynter/5ymeqclzqv2f/wish/113773856 Serotonin - AO1 william_angel https://padlet.com/daniel_paynter/5ymeqclzqv2f/wish/113774003 Low levels of serotonin are associated with aggressive behaviour.

Serotonin usually reduces aggression by inhibiting responses to stimuli that might otherwise leads to to aggressive behaviour.

Study - Mann et al.
Drugs that deplete serotonin (E.G. Dexfenfluramine) have been show to increase aggression levels in participants.
]]> 2016-06-06 10:50:14 UTC https://padlet.com/daniel_paynter/5ymeqclzqv2f/wish/113774003 Dopamine - AO1 william_angel https://padlet.com/daniel_paynter/5ymeqclzqv2f/wish/113774202 Increase in dopamine levels have been shown to produce increases in aggressive behaviour.


Demonstrated in studies that used amphetamines (to increase dopamine activity in the brain) and found an associated increase in levels of aggressive behaviour. (E.G. Lavine - Study)

Study - Buitelaar
Studies that have reduced dopamine levels through the use of antipsychotic drugs have reported a reduction in aggression behaviour.]]> 2016-06-06 10:52:47 UTC https://padlet.com/daniel_paynter/5ymeqclzqv2f/wish/113774202 Serotonin - Evaluation william_angel https://padlet.com/daniel_paynter/5ymeqclzqv2f/wish/113774468 Research Support - Scerbo and Raine:
Meta-analysis of studies before 1992, found lower levels of serotonin in individuals described as being aggressive. This supports the claim that serotonin depletion leads to implulsive behaviour which in turn may lead too aggressive behaviour in varouis forms.

Evidence Supporting - Non-Human animals:
Evidence from the importance of serotonin comes from studies of animals that have been specially bred for domestication and for increasingly docile temperaments. These animals have shown a corresponding increase over generations, of levels of serotonin in the brain.

Evidence from the use of antidepressants:
If drugs that deplete serotonin activity lead to raised aggression levels, then drugs that raise it should lead t lower levels. This is what was found in clinical studies of antidepressant drug, further supporting the link between serotonin and aggression.]]> 2016-06-06 10:55:36 UTC https://padlet.com/daniel_paynter/5ymeqclzqv2f/wish/113774468 william_angel https://padlet.com/daniel_paynter/5ymeqclzqv2f/wish/113775899 2016-06-06 11:11:00 UTC https://padlet.com/daniel_paynter/5ymeqclzqv2f/wish/113775899 Neural mechanisms in aggression: william_angel https://padlet.com/daniel_paynter/5ymeqclzqv2f/wish/113775939 2016-06-06 11:11:27 UTC https://padlet.com/daniel_paynter/5ymeqclzqv2f/wish/113775939 Dopamine - Evaluation william_angel https://padlet.com/daniel_paynter/5ymeqclzqv2f/wish/113776307 Evidence is inconclusive - Couppis and Kennedy:
Evidence for causal role played by dopamine in aggression is inconclusive. C&K's Study on suggests that dopamine may be a consequence rather than a cause. Some individuals may seek out aggressive encounters because dopamine is released as a positive reinforce in the brain when they engage in aggressive behaviours.

Research that challenges:]]> 2016-06-06 11:15:31 UTC https://padlet.com/daniel_paynter/5ymeqclzqv2f/wish/113776307