Aggression Flashcards
(70 cards)
What is the limbic system
Subcortical structures in the brain thought to be closely involved in regulating emotional behaviour.
Role of the amygdala in aggression
- processes emotional information and generates a response, important predictor of aggression
What is serotonin
- a neurotransmitter with widespread inhibitory effects throughout the brain, it has a key role in aggressive behaviour.
how does serotonin affect aggression
normal levels of serotonin leads to a greater degree of self control, lowered serotonin leads to an increase of impulsive behaviour, including aggression
gospic
ultimatum game - split or steal with one confederate, one ppt. ppts with unfair deals became more aggressive, scans revealed a heightened response by the amygdala.
virkkunen
compared levels of serotonin in the cerebral spinal fluid of violent and non-violent offenders, found significantly lower in the violent, impulsive offenders.
what is testosterone
a male hormone (androgen) that is produced in the testes, it is associated with aggression
giamanco
found experimental increases in testosterone are related to aggressive behaviour in several species
neural & hormonal ao3
✅ - backed up by science
✅ - coccaro found the amygdala doesn’t operate alone, it works with the orbitofrontal cortex
❌ - biological determinism could lead to social sensitivity
❌ - biological reductionism, ignores any environmental / psychological influences
✅ - studies have shown paroxetine (increases serotonin) leads to lower aggression compared to a control group
genetic explanations
twin studies, MAOA gene, gene-environment interaction
coccaro
conducted a twin study on concordance rates of aggression, found 50% for MZ twins, and 19% for DZ twins
rhee and waldman
conducted a meta analysis on adoption studies, and found that genetic influences accounted for 41% of aggression
maoa gene
monoamine oxidase A gene controls the activity of the MAOA enzyme, which breaks down neurotransmitters in the brain into their constituent chemicals. lower MAOA gene activity leads to lower MAOA enzyme activity, which is associated with aggression
brunner
studies 28 men in a dutch family who were all violent, impulsive offenders. found abnormally low MAOA levels
stuart
studied 97 male perpetrators of IPV, found the most aggressive had the lowest MAOA activity compared
gene-environment interaction
the effect of both biological and environmental influences on aggression, for example diathesis stress
genetic influence ao3
❌ - coccaro twin study, all share the same environment, therefore a variable that could affect aggression
❌ - rhee and waldman, meta analysis issues
❌ - brunner, maoa activity is all correlational, could be a third variable between maoa and aggression?
❌ - biological determinism could lead to social sensitivity
❌ - leans too far toward nature
ethological explanations
innate releasing mechanisms and fixed action patterns, ritualistic aggression
what is an ethological explanation
seeks to understand the innate behaviour of animals by studying them in their natural environments
what does the ethological explanation say about aggression
that it is adaptive, because aggression is beneficial to survival because a defeated animal is forced to establish territory elsewhere
ritualistic aggression
a series of aggressive behaviours in animals that are carried out in a set order, they are meant to threaten the other animal, because killing the other animal could endanger their species. showing claws, displaying teeth etc.
innate releasing mechanisms
biological structures or processes that are triggered by external stimuli, causing a fixed action pattern
fixed action pattern
a sequence of stereotyped, pre programmed behaviours triggered by an innate releasing mechanism
features of fixed action patterns
stereotyped
ballistic
unchanged by learning
universal