LO2 - theories of criminality Flashcards
biological theories and 2 sub sections
- genetic
XYY, Twin studies, Adoption studies - physiological
Sheldon, Lombroso - brain injuries
- biochemical explanations
Lombroso’s theory
atavistic form = throwbacks to a primitive stage of evolution - suggested people are born criminals and that they’re physically different - spent years measuring their features and found they had distinctive features e.g long arms, enormous jaw and he claimed different criminals had different features e.g murderers had aquiline noses - sample of 383 dead criminals and 3839 living criminals and compared them with soldiers
Sheldon’s theory
certain somatotypes are linked to criminal behaviour
1. endomorphs = soft and fat with a relaxed and outgoing personality
2. ectomorphs = thin and fragile with a self-conscious personality
3. mesomorphs = muscular with broad shoulders with an adventurous and assertive personality
-mesomorphs are most likely to commit crimes as they’re the most risk taking and have the physique for certain crimes
sample of 4000 photos of males
twin studies
studies of monozygotic as they share the same genes and are both developed from the same egg so if one twin is criminal we would assume the other is aswell (concordance rate)
evidence: Christiansen studied 3586 twins in Denmark found 52% concordance rate between MZ twins of having a conviction whereas only 22% in DZ twins
adoption studies
isolates effects of genes from effects of the environment by comparing children to their birth and adoptive parents
evidence: Mednick et al examined 14000 adopted sons and found sons were more likely to have a criminal record if their birth parents did and a smaller proportion did if their adopted parents had one
Jacobs XYY study
extra Y chromosome known as XYY syndrome ‘super male’ tend to be very tall and well built - the extra Y chromosome makes them produce more testosterone so more aggressive and have behavioural problems such as impulsivity
evidence: 1 in 1000 in population but 15 In 1000 in prison
brain injury theories
Phineas Gage whose personality changed after a brain injury
biochemical explanations
- sex hormones - over or underproduction may cause emotional disturbances - testosterone has been linked with crimes such as murder and rape
- substance abuse - alcohol causes about 1000 arrests per day - cocaine is linked to high aggression
individualistic theories
psychodynamic - Freud
Eysenck
learning theories - SLT, Sutherland
cognitive theories - Kohlberg
Bowlby
Freuds theory
says our early childhood experiences determine our future personality and behaviour - in the unconscious mind
id = ‘pleasure principle’, selfish with a blind desire to satisfy urges
superego = ‘morality principle’ - morals we learn by our parents during early socialisation - get an idea of right and wrong
ego = ‘reality principle’ the mediator between id and superego, learns from experience, satisfies both
-weak superego = id takes over and feel less guilt
-too harsh superego = harsh guilt so individual commits crime to escape
-devaint superego - internalised wrong morals e.g criminal father
Bowlby’s maternal deprivation theory
a child needs a close and continuous relationship with their caregiver from birth to the age of 5 to develop normally if not it can lead them unable to form emotional relationships with others (affectionless psychopathy)
evidence: studied 44 juvenile thieves who had been referred to a child guidance clinic - found 39% had suffered maternal deprivation before the age of 5 compared with only 5% of a control group of non-delinquents
Eysenck’s personality theory
3 personality types which makes someone most likely to be a criminal as they crave excitement, thrills and don’t learn crime has negative consequences
PEN model
* psychoticism=immature, emotionally cold and uncaring
* extroverted=needs excitement and becomes bored quickly not introverted
* neurotic=anxious and irrational not stable
devised a personality questionnaire
Sutherlands differential associations theory
individuals learn criminal behaviour - imitate criminal acts by acquiring skills and techniques through observing or learn attitudes through socialisation within a group - may internalise more unfavourable attitudes and values
Operant learning theory
Skinner - if behaviour is rewarded it’s likely to be repeated and behaviour that is punished is more likely not to be
differential reinforcement theory = Jeffery argues if there are more rewards then punishments for a crime people are more likely to do it
social learning theory
Bandura argues we learn most aggressive behaviour by observing and imitating others
bobo doll study - experimented on 4-5 year olds and showed them a video of either a violent or non-violent model and found that children who saw the violent model showed more aggressive behaviour
4 factors that affect SLT
1-attention 2-retention 3-motivation 4-reproduction