criminal psychology Flashcards
how does damage to PFC effect CB
damage effects ability to consider alternative behaviours
aggressive personality
make poor decisions
how does damaged/overactive hypothalamus effect CB
responsible for hormones
increases testosterone = aggressive behaviour
how does damaged/overactive amygdala effect CB
damage can increase fight or flight response
act more impulsively
what did Hyde et al find about amygdala and CB
conducted a study using both male and female participants to investigate the role of the
amygdala in criminality; they found that the amygdala might be involved in criminal and ASB (e.g. higher scores
for psychopathy were associated with lower amygdala activity and that higher scores in ASB were associated
with higher amygdala activity) but did not comment on any gender differences.
what did shirtcliff et al find about neurobiology of ASB
conducted a study investigating the neurobiology of ASB. They found that the
neurobiology involved in emotions such as empathy and callousness is different for males and females. And even
though they didn’t mention the amygdala explicitly, they had previously mentioned that the amygdala is critical
in the regulation of emotions. Therefore it can be assumed that the gender differences they found were due to
gender differences in the structure and/or function of the amygdala.
2 strengths of brain damage explaining CB
Williams et al (2010) found that 60% of 196 prisoners had received some form of brain injury due to
falling, car accidents or sports activities. Those that had brain injury were more likely to enter prison when
they were younger and were more likely to reoffend than those criminals that did not have brain injury.
from alcohol), social judgement and the ability to control impulses.
Pardini found that 26 year old men with lower amygdala volumes were three times more likely to be
aggressive, violent & to show psychopathic traits three years later than men of the same age with normal
sized amygdala’s
2 weaknesses of brain damage explaining CB
Fallon looked at the brains of many individuals using MRI scans and identified one brain with a small
amygdala, and thus as being psychopathic. But it was incorrect and he later found out that the brain he had
been looking at was his own
Kreutzer (1995) found that without the presence of substance use history, traumatic brain injury was not
a risk factor for criminal behaviour
what does PEN stand for
Psychoticism - no remorse, lack of empathy, hostile
Extravert - outgoing, like spending time with others, seek sensation
Neurotic, emotionally unstable, impulsive
how does psychoticism effect CB
Less clear on how P is related to
the functionality of the nervous
system. It has been suggested
that it could be linked to male
hormones such as testosterone,
but there is little research to
suggest this.
how does extraversion effect CB
RAS regulates arousal that
inhbits incoming sensations. So
the indidual will seek external
stimulation to readdress the
balance and reach their optimum
level of arousal. Low levels of
arousal and therefore needs
stimulation from the
environment.
how does neuroticism effect CB
Linked to levels of reactivity of
the ANS. A neurotic has a more
reactive ANS, specifically the
sympathetic bran that is
responsible for the fight or
flight response. It is quick to
‘turn on’ and release adrenaline,
and slow to ‘turn off’.
2 strengths of Eysencks PEN personality
Practical applications. Eysenck’s Personality Questionnaire (which is based on EPT) could be used to
identify individuals that might be at risk of committing crime so preventative steps/particular areas or
individuals could be targeted/put in place, especially if potential criminal behaviour could be detected in
childhood. This could lead to interventions based on parenting or early treatment for delinquency.
Boduszek et al (2013) found that there were higher levels of extraversion amongst inmates who had high
levels of recidivism. Therefore showing that Eysenck’s theory has validity as he said high levels of
extroversion were associated with criminal behaviour.
2 weaknesses of Eysencks PEN personality
Hollin (1989) notes a similar pattern of findings: offenders generally show higher P & N scores but not
necessarily higher E scores.
Blackburn (1993) suggests it appears to be related to psychopathic tendencies, but not in a consistent
way. Without an adequate definition of P, it is not possible to satisfactorily measure it. To measure P,
respondents answer ‘yes’ or ‘no’ to a series of statements about whether they act selfishly and
aggressively. Their scores on such scales are then used to ‘explain’ why high P-scorers act aggressively
and antisocially. This is a circular argument.
how des XYY syndrome effect CB
XYY syndrome is a genetic condition that occurs when a male has an extra male (Y) chromosome within the 23rd
pair of chromosomes, instead of the usual one (XY). They therefore have a total of 47 chromosomes.
Many men with XYY do not even know that they have an extra chromosome. Most boys with XYY will have a
normal development although some may grow faster and taller than their siblings. Some studies have shown
they may have a slightly lower level of intelligence, around 10-15 IQ points below, in comparison to their
siblings, although still within the normal rang. Men with XYY may be more impulsive than XY boys, and also may
be more active physically. XYY syndrome has previously been thought to make men overly aggressive and lack
empathy, leading to it being known as a ‘super-male’ syndrome.
3 strengths of XYY
Gosavi et al (2009) looked at 94 criminals convicted of murder in India and found an association between
criminal behaviour and XYY syndrome. Therefore, suggesting the theory is valid as the mutation is found
within criminals.
Briken et al (2006) found that3 out of 13 sexual offenders that were analysed for XYY syndrome had this
condition. Therefore, increasing the validity of XYY syndrome as the mutation is found is sex offenders.
Stochholm et al (2012) found a significant increase in the number of convictions amongst Danish men in all
crimes (except drug and traffic related crime) in comparison to a control group. Therefore, increasing the
validity of the theory as the research showed tat the risk of conviction was increased for XYY males.