Criminal Psychology Flashcards
What is criminal psychology?
Using psychological knowledge to understand anti-social behaviour and what factors contribute to this behaviour.
Why is it important?
- The knowledge is used within legal settings.
> to interrogate people,
> in the courtroom,
> to treat offenders. - Understanding this behaviour can help to reduce it.
What is anti-social behaviour?
Acting in a manner that causes alarm, harassment, or distress to members of the public.
What is important to know about anti-social behaviour?
It’s not a criminal act in itself, however, it can lead to one.
What is crime?
Behaviour that violates social norms, moral values, religious beliefs, and legal boundaries.
> punishable.
What is recidivism?
Reoffending/repeating a crime or behaviour that you’ve been punished for or are receiving treatment for.
What are the 4 biological explanations of crime?
- Brain Injury.
- Amygdala.
- XYY Syndrome.
- Personality Types/Disorders.
How can Brain Injury explain crime?
- Trauma to the brain can affect behaviour depending on what part of the brain has been injured.
> e.g. amygdala=increased impulsiveness, irritability, and aggression.
> Phineas Gage=damage to PFC—became rude, inappropriate, aggressive.
Who conducted a study on this?
Williams et al.
What did they find?
- 60% of 196 prisoners had some form of brain injury.
- Those who had suffered a brain injury entered prison at a younger age.
- Brain injury may contribute to risk-taking behaviour.
What consequences of brain injury did they find?
- Reduced awareness of emotions.
- Loss of memory.
- Poor concentration.
- Poor impulse control.
- Poor judgement.
What does damage to the amygdala cause?
- Impulsivity.
- Irritability.
- Aggression.
What does damage to the orbitofrontal areas cause?
- Loss of self-regulation and inhibition.
- Impulsivity.
- Lack of sensitivity.
- Impulsive reactive aggression.
What does damage to the anterior brain cause?
- Loss of natural bias away from aggression.
Give some strengths of this explanation.
- Blumer et al—case study.
> ASB can arise after frontal lobe injury.
> Orbitofrontal damage leads to poor impulse control, outbursts and decision making. - Williams et al—60% of prisoners had brain damage.
> high reoffending rates.
> led to intervention to manage brain injury—to ensure people receive support—application. - Diaz—insanity as defence for criminal behaviour.
> most common damaged areas are frontal and temporal lobes.
> studies relate to ASB—link.
Give some weaknesses of this explanation.
- Case studies look at damage and changed behaviour and link them.
> not strong evidence for cause and effect. - Kreutzer et al.
> 20% of 74 patients were arrested pre-injury—only 10% post-injury. - It’s hard to isolate and identify factors affecting criminal behaviour.
> may be things other than brain injury.
> those with brain injury are likely to be mentally ill or drug and alcohol abusers.
> predisposition to offend.
What are some individual differences concerned with this explanation?
- There’s a lack of research on women.
> what there is suggests similar effects to males.
> males are more likely to engage in physical behaviours that bring about these attributes.
> e.g. sports and fighting. - May be e comorbid factors.
> pre-existing disorders.
> exposed to violence at a young age.
How can the amygdala explain crime/ASB?
- The amygdala directs how we react to threatening and stressful situations.
- It works with the PFC to regulate stress—controlling aggression and social interaction.
> if it can’t respond due to damage it may react more aggressively than needed. - Communicates with the HPA to produce sufficient cortisol levels.
> more cortisol when there’s no threat can lead to stress reactions for a prolonged period.
How can abnormalities in the amygdala lead to increased aggression?
- Damage can lead to over reactions and lack of emotion.
- Smaller amygdala have been found in those with psychopathic tendencies and high aggression.
What are some studies that back up this explanation?
- Charles Whitman—had a tumour pressing on his amygdala.
- Raine—looked at brain structure in NGRI offenders.
> reduced left amygdala activity.
> increased right amygdala activity. - Animal studies—stimulating the amygdala with electrical currents.
> increased aggression.
Give some strengths of this explanation.
- Raine.
> noticed difference in amygdala functioning between NGRI and non-offenders. - It’s scientific and reliable.
> brain scans.
> easily controlled variables. - Pardini.
> 503 6 year old males did a study.
> 20 years later 56 of them who showed aggressive behaviour were brought back.
> persisted even 3 yrs later.
Give some weaknesses of this explanation.
- It’s reductionist.
> focuses solely on the amygdala—underplays the complexity of the brain.
> parts of the brain work together. - It’s possible to have amygdala issues and not act psychopathically.
> a neurologist identified a brain as psychopathic—it was his own.
What is XYY Syndrome?
- Occurs only in males.
- Have 47 chromosomes—extra Y one.
- 1 in 1000.
- Doesn’t affect testosterone levels.
- There are physical and behavioural differences.
What are the physical differences?
- Taller and faster growth than siblings.
- More physically active.