Theories Flashcards
BIOLOGICAL : Jacob’s XYY (genetics)
What is it?
Chromosomal abnormalities. 1/1000 newborns are born with XYY (hyper-masculinity). 15/1000 in prison.
Men are naturally more aggressive than women, theory was that men with alter extra Y chromosome will be more aggressive and commit violent crimes.
Early studies show that XYY men are x10 more likely than XY men to be found in criminal populations.
Idea was that XYY men in large numbers would be found in prisons or hospitals.
Problem - XYY men tend to commit non violent crimes.
What are the limitations of Jacob’s XYY?
-genetic abnormalities are widespread throughout the general population therefore doesn’t explain aggression
-THIELGAARD (1984) researched traits of the XYY men compared to XY men and found that aggression wasn’t associated with the XYY men.
BIOLOGICAL : Twin studies (genetics)
What is it?
Dizygotic twins (develop from 2 eggs and share 1/2 genetic material) and monozygotic twins (develop from 1 egg and share all genetic material). Twins are generally raised in the same social environment (equal & controlled) so any greater similarities between identical twins shows evidence for a genetic link.
LANGE did a study with 30 pairs of twins (17dz and 13mz). At least one of each pair commuted a crime (10/13mz= criminals and 2/17dz=criminals).
The chance of one twin taking part in criminal behaviour when the other twin was is 50% in mz and 20% in dz.
What are the limitations for Twin studies?
-small sample
-early study like LANGE lack validity and were inadequately controlled
-can’t discount nurture if they were brought up in the same environment
-Monozygotic twins are usually treated more similar than dizygotic twins
BIOLOGICAL: Adoption studies (genetics)
What is it?
The aim is to separate the impact of environment (adopted parents) from the influence of inheritance (biological parents) and figuring out if someone commits crime based on upbringing (nurture) or genes (nature). And the behaviour of the adopted child is compared to the effects of their adopted and biological parents.
Research shows adoptee with a biological parent who is a criminal is more likely to commit crimes (more likely in boys).
Adopted individuals who were born to imprisoned female offenders were likely to commit crimes as an adult.
What are the limitations of Adoption studies?
-The age of adoption may affect whether adopted children have been influenced by biological parents/adopted parents
-information about biological parents isn’t always available
-the adoption process isn’t random, children are often placed with similar families
BIOLOGICAL : Lombroso’s theory (physiological)
What is it?
LOMBROSO stated that criminals are a separate species and they’re a throw back to an earlier stage of evolution. He studied 4000 Italian criminals and 400 Italian criminal skulls. He called the abnormalities the ‘stigmata’.
He said that several ‘atavistic’ characteristics are what make clear signs that someone is a criminal (ape like, large ears, big hands, long arms, excessive wrinkles, monobrow, hawk like noses, large jaw, plump lips).
He stated that tattoos were seen as markings of a born criminal because it shows an insensitivity to pain.
What are the limitations of Lombroso’s theory?
-far too simplistic theory
-no control group
-not everyone with atavistic features are criminal
-scientific racism, DELISI (2012) indicate many atavistic features are specific to people of African decent
-culture bias
BIOLOGICAL : Sheldon’s theory (physiological)
What is it?
SHELDON argues that criminal behaviour links to physical form. He came up with 3 different body types:
-endomorph (fat and soft) = sociable, relaxed, funny
-ectomorph (skinny and fragile) = socially anxious, private, withdrawn
-mesomorph (muscular and hard) = dominant, aggressive, adventurous
He said that mesomorphs are more likely to be criminals because of their high testosterone levels so they have more aggression.
He studied photos of 4000 men and rated them on a scale of 1-7 on their resemblance to mesomorph. He had a control group of 200 college student to compare to. GLUECK & GLUECK found that 60% of offenders in their study were mesomorphs.
What are the limitations of Sheldon’s theory?
-cannot generalise
-other body types can also be criminals (doesn’t explain how end and eco body types can be criminals)
-a persons body type isn’t fixed, can change throughot their life
-are mesomorphs targeted for crime/deviance? (self-fulfilling prophecy)
-gender bias
-not much was known about the criminal histories of the control group
BIOLOGICAL : Brain chemistry
What is it?
Serotonin is a neurotransmitter produced by the brain and regulates mood, it’s thought to influence how impulsive a person is. Research into low serotonin levels and criminal behaviour has been taken out.
Serotonin can be influenced by our diet (tryptophan is found in food which is what boots serotonin). Eggs, soy products, carbs.
In FINLAND, violent offenders and impulsive fire-starters had lower serotonin levels, showing that this can be linked to more sever forms of antisocial behaviour.
People who take large amounts of steroids (often taken to increase muscle growth and testosterone levels) can become extremely violent.
HORACE WILLIAMS, American body builder, beat a man to death after taking x2000 the recommended dosage of steroids.
BIOLOGICAL : brain structure
What is it?
PHINEAS GAGE was working on a train track and a 3ft metal pole went through his pre-frontal lobe. He turned from a pleasant calm person to (after his recovery) agitated, aggressive and “just not Gage”.
IDIVIDUALISTIC : Sigmund Frued (psychodynamic)
What is it?
He believed that the best way to understand behaviour is to examine early childhood experiences and that criminality is linked to guilt. Freud stated that our mind works in a way where the unconscious mind (we cant see it) controls our behaviour.
He stated that our PSYCHE (personality) has 3 parts:
-ID = desires/pleasures/control our selfish urges. Wants instant gratification and represents basic needs, found in deep unconscious of the brain.
-EGO = reality/rational control to make decisions to delay the id’s urges. Acts as a mediator between id and superego.
-SUPEREGO = knows what’s socially acceptable/understands morals/conscience (restricts us from doing bad). Tells us what’s right or wrong. Develops at around 5 years old. Acts as a parent and punishes the ego with anxiety when an immoral act is contemplated and guilt if its carried out.
He stated that this is determined in the first 5 years of life (root of offending is also found at this period, especially relationship between a developing child and parents). To be healthy you need a balance of all parts, if not equal its a disturbed personality which can lead to criminal behaviour, 3 reasons as to why:
-WEAK SUPEREGO : thought to develop through the result of abnormal relationships with family. This results in a person not having worries about taking part in antisocial behaviour. Don’t really see criminal acts as wrong, happy to act in a way that will satisfy id.
-DEVIANT SUPEREGO : child may develop a superego in a normal way but the superego itself may have deviant values. The superego is meant to punish behaviours that the same sex parent would find unacceptable. So, if a son was raised normally but had a criminal father, they may not react to crime in a normal way, may see it as acceptable/normal.
-STRONG SUPEREGO : make someone anxious and guilty a lot of the time as every time they acted on their id’s desires (no matter how small) they would punish them for it. This can result in a person committing crimes in order to get caught and punished, to ease the guilt that is forced onto them by the strong superego. May also prevent a person from pressing antisocial desires that build up (normally would express desires harmlessly through defence mechanisms, e.g. letting out anger in sports). Superego would prevent this from happening, aggression and desires can build up over time and overwhelm the ego - enough to make these expressed suddenly and violently (e.g. murder/rape).
pointed out the importance of of childhood experiences and adolescence when it comes to offending. Pointed many researchers in useful directions when it comes to studying crime.
What are the limitations of psychodynamic theories?
-not scientific (we cant see and therefore study the unconscious mind - cant prove it exists)
-only explain behaviour after it happens
-highly subjective, two different researchers can draw very different conclusions
-studies can be very time-consuming
INDIVIDUALISTIC : Bowlby’s ‘affectionless psychopath’ (psychodynamic)
What is it?
He stated that the ability to form meaningful social relationships in adulthood relied on a close, warm and continuous relationship with the mother in the first few years (since it acts as and example for all future relationships). Disruption could damage the persons ability to relate to others.
Early ‘maternal deprivation’ was related to later criminal behaviour.
In his study 44 thieves reported that 39% of a group of young criminals have experienced disruption to their attachments with their mother, compared to 5% of non-criminal group.