Neural and Hormonal Mechanisms in Aggression
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?- Created by: Thunder1107
- Created on: 24-01-18 11:57
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- Neural and Hormonal Mechanisms
- Evaluation
- Testosterone
- Most of the studies are correlational which isn't causation
- Leads to inconsistent evidence and support
- Beeman's study has ethical issues ( C, W, P )
- Most of the studies are correlational which isn't causation
- Amygdala
- The studies by Kulver and Bucy could be seen as ethically wrong (P, C, W)
- The study by Mark and Ervin is ethically wrong (P)
- Hippocampus
- the study by Boccardi covers a socially sensitive issue which could have implication
- This is also true for Raine's study because it could be used like screening
- Serotonin
- The dexfenfluramine study was only tested on males so can't be applied to females
- Tryptophan can be used to calm patients and inmates (real-life app\0
- Raleigh's study may be ethically wrong (P, C, W)
- Testosterone
- Neural
- The Limbic system (LS)
- The LS is responsible for emotions including aggression
- It includes the: Amygdala (A), Hippocampus (H) and hypothalamus
- Amygdala (A)
- Kluver + Bucy found taming effect in monkeys by destroying the A
- Narabayashi found 43/51 Ps with destroyed As were + aggressive
- Mark and Ervin electrically stimulated the A of a P + she grimaced and became aggressive
- Pardini found reduced A was -vely correlated with aggression
- Hippocampus (H)
- It compares threats and past experiences
- Impaired H function prevents the NS from putting things in context
- Boccardi found that violent C's had abnormal H functioning
- Raine found violent C's had asymmetrical H in each hemisphere which impaired H + A talking
- Serotonin (S)
- S is a neuro-transmitter which has a calming effect on the A
- Low S levels means people are more impulsive + aggressive (S deficiency hypothesis)
- Raleigh found reducing S in monkeys brains = more aggressive behaviour
- Tryptophan was given to criminal juveniles which raise levels of S
- Dexfenfluramine lowers S and results in + aggression and hostility.
- The Limbic system (LS)
- Hormonal
- Testosterone (T)
- Beeman (47) castrated male mice + found aggressive behaviour reduced
- He then injected with T to make them more aggressive
- T is also clearly related to aggression in human males
- Dabbs (90) measured T in saliva of male prisoners + found more in violent prisoners
- Carre and Olmsted - T levels change with enviro and stimuli
- Mazur says we should distinguish between aggression + dominance
- Testosterone (T)
- Evaluation
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