unit 2 2.1- 2.3 Flashcards
name the 4 types of biological theories
physiological, genetic, brain injuries and disorders, biochemical explanations
name the 2 physiological theories
Lombroso’s and Sheldon’s
summary of Lombroso and examples
‘born criminals’. in 1876 he said criminals can be identified through physical features e.g. large jaws, long arms and murderers had sharp noses while thieves had flat noses.
what is atavism
pre-social, unable to control impulses and had reduced sensitivity. Arguing they were like apes.
summary of Sheldon and give examples
in 1940s Sheldon saw criminals as physically different, certain ‘somatotypes’ are linked with criminals e.g. endomorphs (fat and round), mesomorphs (broad and muscular. more likely to be criminals) and ectomorphs (tall and thin)
name the 3 genetic theories
twin studies, adoption studies and XYY study
summary of twin studies and give evidence
people who have ‘criminal genes’ are likely to have the same genes with relatives. study monozygotic twins as they are both developed by the same egg. e.g. Christiansen 1977 study of 3586 twins in Denmark. 52% concordance between mz and 22% with dz
summary of adoption studies and give evidence
compare adopted children with biological and adoptive parents. (comparing genes with environment). e.g. Mednick et al 1984 studied 14,000 adopted sons in Denmark. 20% if biological parents were also criminals and 15% for adoptive.
XYY study summary and give evidence
Jacob et al claimed more aggression and violence. prisoners and psychiatric patients had high levels of XYY. most likely to commit property crimes
summary of brain injuries and disorders
Phineas Gage ( personality change due to frontal lobe injury) studies show prisoners are more likely to have brain injuries.
abnormal EEG readings among murders and psychopathic criminals
4 types of biochemical explanations
sex hormones, blood sugar levels, substance abuse and other substances.
summary of sex hormones and give examples
males- overproduction or underproduction can lead to disturbances and criminal behaviour. Ellis and Coontz show testosterone levels peak from puberty to early 20s and this correlates with crime.
females- PMT and post-natal depression have been accepted for defences of shoplifting (controls mood and hormones)
blood sugar levels and examples
low blood sugar can trigger aggression. alcohol consumption can lead to violence. Schoenthaler claims lowering sucrose intake could reduce anti-social behaviour
summary of substance abuse and give examples
taking drugs both legal and illegal. Saunders said this played a significant role in about 1000 arrests per day in USA
what are the 4 types of individualistic theories
psychodynamic, personality, learning and cognitive theories