aggression Flashcards
linked the limbic system to emotions such as aggression
papez and maclean
used brain scans (fMRI) with participants in a lab based game that provoked aggression to observe the amygdala, found that BENZODIAZEPINE reduced aggression.
gospic
found lower levels of serotonin metabolite 5-HIAA in violent impulsive offenders compared to non impulsive offenders
virkkunen
found a positive correlation between testosterone and aggression in male offenders with histories of impulsive violent behaviour
dolan
argued that non-limbic brain structures are also involved such as the orbitofrontal cortex, found that OFC activity is reduced in psychiatric disorders featuring depression
coccaro
participants took part in a lab-based game where they either gave or received electric shocks in response to provocation and found that participants who took PAROXETINE (raises serotonin levels) gave fewer and less intense shocks
berman
found that while neural factors may have a direct link to aggression, they may also be indirect, other factors may influence the link between serotonin and aggression
denson
conducted an animal study to show that testosterone has a key role in aggression by studying male rhesus monkeys during mating season
giammanco
proposed the dual-hypothesis theory that suggested that high testosterone levels lead to aggression but only if cortisol levels are low
carre and mehta
studied MZ and DZ twins and found: physical aggression had concordance rates of 50% for MZ twins and 19% for DZ twins, for verbal aggression it was 28% for MZ twins and 7% for DZ twins
coccaro
conducted a meta-analysis of adoption studies and found that genetic influences account for 41% of the variance of aggression
rhee and waldman
studied 28 male members of a dutch family who had been repeatedly involved with violent crimes and found these men had abnormally low levels of MAOA enzyme and the MAOA-L variant
brunner
found an association between antisocial aggression and the MAOA-L gene in adult males but only those who had experienced significant trauma before the age of 15 (diathesis-stress)
frazzetto
found that while men with the low-activity MAOA gene were more aggressive, their high-activity MAOA gene counterparts were more co-operative and much less aggressive in a money distributing game
mertins
observed how aggression in children at play led to dominance hierarchies, giving evidence that aggression is an adaptive trait
pettit
observed that most intra-species aggression consisted of ritualistic signalling and rarely led to actual physical violence, evidence for adaptive nature of aggression
lorenz
argued that a Fixed Action Pattern is an unchanging behavioural sequence found in every individual of a species and follows an inevitable course which cannot be altered before it is completed
lea
found that when presenting male sticklebacks with wooden models with red underbellies, this caused an Innate Releasing Mechanism to trigger the FAP and once started, it would run its full course and did not change from time to time
tinbergen
argued that instead of genetics having a huge influence, culture could over-power it, homicides based on reactive aggression were more common in the southern states of the US compared to the north
nisbett
found that same-species aggression is not always ritualistic as lorenz suggested by observing male chimps killing member of the community even though they offered appeasement signals
goodall
argued that FAPs are influenced by environment and learning rather than being innate genetic mechanisms, the sequence of behaviours in a FAP varies between individuals and situations
hunt
identified two major mate retention strategies: Direct guarding- male vigilance over partner’s behaviour, and Negative inducements- threats for consequences of infidelity
wilson and daly