AQA A Psychology PSYA3 Neural and Hormonal Mechanisms in Aggression

I hope this helps :)

HideShow resource information
  • Created by: meg
  • Created on: 25-05-13 22:32
Preview of AQA A Psychology PSYA3 Neural and Hormonal Mechanisms in Aggression

First 302 words of the document:

Neural and Hormonal Mechanisms in Aggression
Neurotransmitters
A chemical that enables impulses within brain for travel
Low levels of Serotonin and high levels of Dopamine associated with aggression in animals and
humans
Serotonin
Reduce aggression by inhibiting response to emotional stimuli that could cause aggression
Low levels of serotonin ­ increased susceptibility to impulse behaviour, aggression and violent
suicide
Some drugs thought to alter serotonin ­ increase aggressive behaviour
Mann ­ 35 healthy subjects dexfenfluramine ­ depletes serotonin ­ in males was associated with
increase of aggression and hostility ­ BUT NOT FEMALES ­ found through questionnaire to
assess aggression and hostility levels
Dopamine
Not as well established as serotonin
Lavine increase of dopamine through amphetamines associated with increase in aggressive
behaviour
Buitelaar antipsychotics that reduce dopamine levels show to reduce aggressive behaviour in violent
criminals
Hormonal Mechanisms
Testosterone
Influences aggression on young males due to action on brain areas involved in controlling aggression
Dabbs ­ measured salivary testosterone in violent and nonviolent criminals. Those with higher levels
did have a history of violent crime, lower levels nonviolent crimes
Lindman ­ young males who were aggressive when drunk ­ higher testosterone levels than those
who did not when drunk
Wingfield ­ the challenge hypothesis ­ in monogamous species, levels should only rise above
baseline breeding level in response to social challenge (e.g male v male and threat to status). Rise in
testosterone if threat is deemed relevant to reproductive competition (dispute over female)
Cortisol
Dabbs Increases anxiety and likelihood of social withdrawal
High levels inhibit testosterone levels so will inhibit aggression
Virkkunen ­ found this in habitual offenders
Tennes and Kreye ­ found this in violent school children
Meta Analysis

Other pages in this set

Page 2

Preview of page 2

Here's a taster:

Archer ­ results of 230 males over five studies ­ found low positive correlation between
testosterone and aggression. However, type of participant and form and measurement of aggression
differed substantially between studies
Book ­ 45 meta analysis ­ mean correlation of 0.14 between testosterone and aggression, although
Archer clams that methodological problems with study meant correlation of 0.08 more appropriate
Scerbo and Raine ­ 29 studies published before 1992 examined neurotransmitter levels in antisocial
children and adults.…read more

Page 3

Preview of page 3

Here's a taster:

Mazur ­ suggests we should distinguish aggression from dominance ­ aggression = violence,
dominance = social status
Also claims aggression just a type of dominance behaviour
Nonhuman animals ­ influence of testosterone levels expressed through aggressive behaviour
Humans however, influence of testosterone on dominance likely expressed in more varied and subtle
ways (e.…read more

Comments

No comments have yet been made

Similar Psychology resources:

See all Psychology resources »See all resources »