Criminals Flashcards
What did christiansens twin study show about the biological link with criminality
Found that from 3586 pairs of twins if an ode tickle twin was a criminal, for identical twins 52% of the time the other twin was also a criminal. For non-identical twins the rate was only 22%.
What is the XYY chromosome
A rare genetic pattern said to be linked with aggression and slow learning.
Why is the evidence stating that the XYY chromosome might be a criminal gene not valid
Only a handful of murders have had an XYY chromosome. We cannot find enough samples of people with the disorder to be certain of the link to violent crime.
How do adoption studies provide strong evidence for the biological explanation of criminals.
They look at relatives, siblings and twins that are adopted at a young age. Meaning they share genes and not environment as they have different parents. By taking the environment out of my he picture, we can be sure that genetics are the cause of criminality.
How can we see if criminality has a biological basis
We can compare the family trees of criminals and non-criminals - if many criminals’ relatives are also criminals there might be a biological link.
Twin studies
Adoption studies.
Name 5 social explanations for criminality
Maternal deprivation Family size Divorce Childrearing Self fulfilling prophecy.
What are family patterns
The experiences children have during their family life.
Why is divorce a social explanation for criminality
If parents are divorced, individuals are more likely to have criminal tendencies due to factors such as money difficulties, moving house, arguments in the home.
Why is maternal deprivation a social explanation for maternal deprivation
If children are separated from their main caregiver before the age of 2 it can cause problems in their later life. They typically lose the sense of having a safe world and feel rejected.
Why can family size be a social explanation for criminality
More than six children in a family can result in children being more likely to be criminals because each child may get less attention and supervision. Also the parents income will have to be shared between each child so they may have fewer educational opportunities.
What did a study by western show about the link between parents occupation and criminality
Found a slight link between parental occupation and youth crime, a fathers occupation was not an indicator but the mothers occupation did have an effect.
Why is it difficult to pin down which social factors affect crime
Family circumstances are complex. It seems likely that a combination of factors contributed to criminality.
How is childrearing an explanation for criminality
The way in which parents bring their children up is known as childrearing strategies. Some strategies can affect the child mentally.
What are the three strategies of childrearing
Induction
Love withdrawal
Power assertion
As a childrearing strategy, what is induction
Where parents explain to their child what that have done wrong and allow them to think about their consequences. Children can then make the right decision next time.
As a childrearing strategy, what is love withdrawal
When parents put conditions on their love, they don’t love their child when they have done something bad. Results in child being confused about their identity, unsure to whether they are loved or not.
As a childrearing strategy, what is power assertion
Includes hitting, shouting at child, humiliating them, grabbing then extra. Can lead to aggression in child.
What is a self fulfilling prophecy
When the expectations of others influence our behaviour
What is conform
To adjust to expectations made of us
What is the self fulfilling prophecy explanation of criminality
Is we are seen as or expected to be a criminal we will behave in that way.
Why is self fulfilling prophecy an explanation for criminality
People conform to the behaviour that is expected of them. So if someone is seen as likely to become a criminal it is likely they will be due to self fulfilling prophecy.
What was the aim of Rosenthal and Jacobsen’s experiment
To test whether achievement could be a self fulfilling prophecy.
What was the procedure of Rosenthal and Jacobsen’s experiment
They gave children an IQ test and then told the teachers which children were going to be ‘bloomers’ and which ones were going to be ‘average’(this was a lie, the names were random).
What were the results of Rosenthal and Jacobsen’s experiment
They found that teachers didn’t expect much or not he ‘average’ children and gave all their attention to the ‘bloomers’. The IQ of the bloomers rose and the IQ of be average children fell.
What are some Issues with the theory of self fulfilling prophecy as an explanation of criminality
It would be very unethical to study self fulfilling prophecy as a cause of crime by treating someone differently and seeing if it affected their behaviour.
Also many of use reject the way we are treated by others and so do not fulfil the prophecy.
Compare the biological and social explanations for why people are criminals
B- Focuses on how we are born a criminal - we inherit genes that cause criminal behaviour.
S - focuses on how we are made criminals, being brought up in a family that makes criminal behaviour more likely.
Compare the evidence to support the biological and social explanations of criminality
B- adoption studies show how crime can be inherited. XYY chromosome abnormality may cause aggression in males, leading to violent crime.
S- maternal deprivation can cause distress and mistrust that affects later development. Self fulfilling prophecy explains how our behaviour can be influenced by the way we are treated.
Compare the weaknesses of the biological and social explanations for criminality
B- weakened by the confusion between genetics and upbringing in twin & family studies. Chromosome research is limited as only small samples have been studied.
S- theory cannot separate the influence of many social factors that influence criminality. People often revel against how they are treated by others.
What is the aim of theilgaard study of the criminal gene
She wanted to see if criminals had a particular gene that could be responsible for their criminal behaviour.
What is the procedure of theilgaard study of the criminal gene
They took blood samples from over 30,000 men, 16 had the XXY and 12 had the XYY abnormalities. They were interviewed about their backgrounds and criminal history. A personally test was so used to see if they displayed aggression.
What is the results of theilgaard study of the criminal gene
Found that XYY males had slightly lower intelligence and were more aggressive than average. However no solid evidence of a criminal gene was found.
What is the conclusion of theilgaard study of the criminal gene
Study provides limited evidence for XYY makes being more aggressive than XXY males.
What were the strengths of theilgaard study of the criminal gene
All tests and interviews were conducted by an independent social worker who didn’t know the aim of the study - no interview bias.
Used a vast range of tests to measure different aspects of the men’s lives, backgrounds and personality.
What were the weaknesses of theilgaard study of the criminal gene
The link between XYY makes and aggression is only a correlation - the chromosome abnormality may not have caused the increased aggression.
There was only a small sample of men used for the investigation. 1/1000 males are born XYY.
What is a correlation
A measure of an association or relationship between two factors or variables.
What are controls
Ways to keep variables cons that in all conditions of an experiment