criminal psychology Flashcards
what did Brunner do in 1993?
published a research paper about the association between genes and aggressive behaviour
what did Brunner say about genes and aggressive behaviour?
he emphasised that there was no one gene for crime, and had suggested an association rather than a cause between genes and aggressive behaviour
the MAOA gene was said to be related to aggressive and violent criminal behaviour
what is MAOA?
the function of MAOA is to breakdown/metabolise excess serotonin in the brain, thus helping to control the levels of serotonin available for take up by the brain
what was brunner’s study?
brunner was a doctor in a Netherlands’ hospital and was approached by a woman for genetic counselling
there were a number of males in her family that suffered a syndrome of mental-retardation that was associated with aggressive antisocial and violently criminal behaviour
further research found 14 males in the woman’s extended family had a genetic mutation. This was a mutation of the X chromosome which had passed along the maternal line
Brunner discovered it was a mutation of this gene that stopped them producing any MAOA. This is now known as Brunner syndrome and only this family is known to be affected
a case study found the lack of MAOA increased their serotonin levels which is therefore associated with aggressive behaviour
some of the criminal activity the males had engaged in from this case study include attempted rape, exhibitionism, arson and assault
what was lombroso’s theory of atavism 1876?
argued that criminal is a sub species of human
argued that the physical shape of the head and face determined the ‘born criminal’
features also included a heavy jutting jaw, low brow, a flattened nose, protruding ears, extra fingers, toes and nipples
background to raine’s study?
studies have repeatedly shown violent offenders have poorer brain functioning compared to controls. Until Raine’s 1997 study, it had not been possible to localise which specific brain areas may be dysfunctional in violent offenders
at the time of his study, only some previous research had linked dysfunction of the prefrontal cortex to aggression. for most people, this part of the brain can ‘put the brakes on impulsive behaviour’ and prevent people from being aggressive
the introduction of brain imaging research made it possible for Raine to directly assess brain functioning in violent individuals
what was the aim of raine?
to investigate differences in murderers’ brains and nonmurderers’ brains and to find evidence that the murderers were Not Guilty by Reason of Insanity (NGRI)
what does NGRI mean?
argues that the defendant is not responsible for their actions due to a psychiatric disease at the time of the criminal act. It is rarely used but is sometimes successful
why was NGRI-pleading murderers a suitable sample for Raine?
it was hypothesised that murderers pleading NGRI would have localised brain impairments but at the same time, there was no brain imaging research on this target population
sample of raine?
41 murderers (39 men, 2 women). mean age 34.3 years.
41 nonmurderers (39 men, 2 women), mean age 31.7 years
6 participants were matched. across the conditions, participants were the same sex and age. 6 ps in each condition had schizophrenia. this study is a matched pairs design
all participants were kept medication free for the 2 week period preceding brain scanning
what are PET scans?
a small amount of radioactive glucose (called a tracer) is injected
the PET scanner takes a picture of where the glucose is being used in the brain
the active parts of the brain use up more glucose so show up brighter in pictures
IV and DV of raine?
IV = murderers vs nonmurderers
DV = glucose metabolism (quantitative data)
procedure of Raine?
all ps were kept medication free for 2 weeks leading up to the brain scan
10 minutes before being given the FDG injection, ps were given practice trials on a Continuous Performance Task. The CPT task required ps to search for targets on a screen and press a button to indicate when the targets were spotted
ps were then injected w the FDG which was the radioactive tracer
ps then completed the CPT task
after 32 minutes, the participant went straight to the PET scanning room and their brain was scanned to measure brain activity in the cortical and sub cortical regions
why was the CPT task used in Raine?
the CPT task was used bc it produces glucose metabolism in parts of the brain
results of raine regarding the prefrontal cortex?
there was reduced activity in the murderers’ prefrontal cortex compared to the controls
the prefrontal cortex plays a central role in the functions such as impulse control
reduced activity can explain criminality as murderers had less control making it more difficult to have constraints on aggressive behaviour
findings about the angular gyrus in raine?
there was less activity in
the murderers’ left angular gyrus
compared to the murderers
The angular gyrus has been linked
to lower verbal and reading ability,
educational failure, occupational
failure and thus, crime.
finding about the amygdala and hippocampus in raine?
Murderers had less activity in the
left amygdala and left hippocampus
compared to controls.
The amygdala is responsible for fear so
reduced activity in this part of the brain
can mean someone is more likely to
commit crime due to fearlessness.
finding about the thalamus in raine?
Murderers had less
activity in their left
thalamus compared to the
non-murderers.
The thalamus and
hippocampus play a role in
learning and memory.
Reduced activity in the
thalamus suggests
murderers are impaired
with learning from
experience (e.g.,
behavioural mistakes)
finding about the corpus callosum in raine?
Murderers had less activity in
their corpus callosum compared to the
controls
Less activity in the corpus callosum
(which transfers information between
the hemispheres)can prevent the left
hemisphere from inhibiting the right
hemisphere’s generation of negative
emotions…leading to aggressive
behaviour.
finding about the temporal lobe?
no differences were
found between the
conditions suggesting
that brain
abnormalities in
murderers may not be
in all parts of the brain
conclusions of raine?
There’s evidence that murderers pleading NGRI
have brain differences to non-murderers.
It is possibly a combination of abnormal brain
processes that leads to someone being a
criminal (not just reduced activity in one part of
the brain)
why did raine say that the results from his research should be used with caution?
because we cannot:
- say that biology alone contributes to crime
- say NGRIs are not responsible for their actions
- diagnose murderers
- generalise as the control/comparison group did not contain a non-violent criminal control group
evidence for the biological strategy of intervention programmes for children involving diet, exercise and cognitive stimulation
in another one of Raine’s studies conducted in Mauritius, he investigated 100 children with a low resting heart rate. The children had a 3 part intervention programme. This programme focused on:
- Nutrition (given milk, fruit juice and a hot meal a day of chicken, fish or mutton with salad)
- Physical exercise (afternoon sessions of gym, structured games and free play were run)
- Cognitive stimulation (children went to 2 specially constructed nursery schools that aimed at using different methods of toys, arts, handicrafts, drama and music)
These children were compared to a control group who did not have this specialised programme
During a follow up at age 11, the research found the children could focus better and had more matured brains
In addition, the level in their brains increased. During a follow-up at age 17, they found the children also scored lower on conduct disorder ratings.
evidence for biological strategy of omega 3 adminstration?
a further 100 children in Raine’s study participated in a trial with omega 3
for 6 months, children had a daily juice drink called Norwegian Smartfish, which contained a whole gram of omega 3
they were compared to a control group who just drank the juice with no omega 3 supplement
after 13 months, parents reported a significant reduction in aggression, delinquency and attention problems in those taking the drink
their behaviour was measured before, at the end of the trial (at 6 months) and 6 months after the trial finished
Raine said omega 3 enhances brain structure and function, boosts cell size and regulates neurotransmitter functioning
what did Lewison find about the effects of plastic surgery on criminals?
Dr Lewison performed facial reconstructive surgery on prisoners and tracked their post-surgery behaviour
by 1965, Lewison had performed surgery on 450 patients in a Canadian prison
Behaviour changes were observed almost immediately– there was more cooperation and they participated in more prison activities. Previously hostile criminals became polite
what is chemical castration?
chemical castration involves the use of drugs to lower the production of sex hormones such as testosterone. This procedure can be used to top sex offenders from re-offending
in the UK, this procedure is voluntary
what are biological strategies for preventing criminal behaviour?
intervention programmes for children involving diet, exercise and cognitive stimulation
omega 3– fatty acids
plastic surgery
chemical castration
how to answer part c crimpsych questions?
two strategies minimum
write what suggestion is
write how you would do it
write when/where it would be used
write why (support with evidence from study)
ALWAYS LINK TO SCENARIO– need to embed all of the characters from the question into ur answer
what is forensic evidence?
information collected from a crime scene, eg ballistics, blood spatters, footprints, tyre prints, bite marks, DNA, fingerprints etc
what are the strengths of using fingerprints as forensic evidence?
it is cost and time effective and relatively easy to analyse
no two people have ever been found to have the same fingerprints
we now have national and international digital databases which store fingerprints, this makes analysis of a match much easoer
what was a real life error in finger print analysis?
in 2004, a series of bombs went off in Madrid. Many people were killed which led to an FBI investigation
A latent fingerprint (created by sweat) was found on a bag which was believed to have belonged to the bomber as it contained detonating devices.
A suspect was identified who was named as Brandon Mayfield. He was actually just one of 20 other matches but he had been a person of interest since 9/11. A number of experts confirmed the fingerprint was Mayfield’s
Mayfield protested his innocence until the Spanish police matched the print to the real bomber– Ouhnane Daoud. A formal apology was given to Mayfield by the US government was reportedly given a $2million settlement
why do errors with fingerprint analysis occur?
cognitive biases– there might be a confirmation bias. this means people might give emphasis to, or intentionally look for evidence to confirm their beliefs
Itiel Dror suggested that because a human ultimately makes the decision as to whether there is a match, human error may occur
what is bottom-up processing?
examination of ridge patterns and characteristics. ‘Zooming in’
what is top down processing?
using contextual elements such as prior experience/knowledge, emotional state, and general expectations
this is where biases can occur and override objectivity
what are some examples of cognitive biases that could influence fingerprint analysis?
OBSERVER/EXPECTANCY EFFECTS: the expert anticipates the outcome as a result of info from another expert
CONFORMITY EFFECT: when you’re asked to validate the opinion of a peer you’re more likely to agree with them
NEED-DETERMINAITON PERCEPTION: a bias due to a strong desire to solve a crime (strong motivation to solve case eg Madrid Case)
what was the aim of dror 2006?
do contextual influences create biases in fingerprint experts?
sample of dror 2006
5 fingerprint experts recruited with 85 years of experience between them
procedure of dror 2006?
signed consent form giving permission that at sometime in the next 12 months, theyll be tested in their normal working environment
they were asked to analyse a pair of fingerprints that they had previously declared as matching in a real life case 5 years earlier (but they did not know this during the research). They were told that the pair of prints had been mistakenly matched previously by the FBI as the Madrid Bomber
findings of dror 2006?
4 of the ps changed their identification from 5 years earlier
3 of these 4 ps now judged the fingerprints as ‘definite non-matched’ but one of these 4 now judged that there was insufficient information to make a definite decision
conclusion of dror 2006
fingerprint experts decisions can be influenced by contextual influences
aim of dror 2005
what are the effects of top down processing (emotion and subliminal messages)
sample of dror 2005
27 university student volunteers
procedure of dror 2005
ps asked to analyse 96 good quality or incomplete poor quality fingerprints. also given emotional stimuli (case details about bike theft) or high emotional stimuli (case details about a murder). photographs were also used
findings of dror 2005
when the fingerprint was poor quality, ps relied more on the contextual information– they were also affected by the emotional context
they were more likely to say a pair of prints was a match when analysing poor quality prints
what is the current protocol for analysis prints in the met police?
involves providing the fingerprint examiner with a copy of the crime scene report. this report details the nature of the crime but does not provide any photographic images of the crime scene
background of hall and player?
wanted to investigate whether real fingerprint experts (rather than students as previously used by Dror) would be affected by the emotional context of the crime scene report
previous research by dror found that non-experts were more likely to identify a match between fingerprints when presented with a high emotional context rather than a low emotional context
aim of hall and player
to investigate whether the written report of a crime will affect a fingerprint expert’s interpretation of a poor quality fingerprint mark
to investigate whether fingerprint experts are emotionally affected by the circumstances of a case
sample of hall and player
70 ps
worked at the Metropolitan Police Fingerprint Bureau
Length of experience ranged from less than 3 months to more than 30 years
Mean length of experience 11 years
VOLUNTEER SAMPLING METHOD
all asked to participate in work time
details of experiment were not disclosed
what were the conditions in hall and player
condition 1 = low emotional context, allegation of forgery. trying to pay for some goods with a fake £50 note
condition 2 = high emotional context, allegation of murder. trying to pay for some goods with a fake £50 but then they shoot the guy twice
design of hall and player
independent measures
procedure of hall and player
ps either received the low emotional or high emotional context crime scene report. just like in real life, fingerprint experts did not have to read the report. 35 ps were in each condition
ps were given a £50 note with a superimposed (placed on the note using a computer) fingerprint in the corner. they were told to treat the task as part of their normal working day
they had a magnifying glass to help then analyse the note against the suspects fingerprints. Ps were also provided with a Russel comparator.
to obtain quantitative data, the experts were asked to consider whether the note mark was a match, not a match, insufficient (not enough detail to make a comparison) or insufficient detail to establish identity.
To obtain qualitative data, ps were also asked to elaborate on their findings by providing observations and opinions
finally, ps completed a feedback sheet which asked whether they had referred to the crime scene report prior to their assessment of the marks and to indicate what info they had read. if they had referred to the report, they had to state whether they felt that the information contained on the report had affected their analysis, and if so, how.
what were the materials in hall and player
cannon laser 1000 printer
test mark on £50 note
10-print fingerprint form
magnifying glass
russel comparator
computer that superimposes
results of hall and player
no significant difference was found between the two conditions. the emotional context of the crime scene reports did not affect the overall outcome of whether the analysts thought the prints were a match
52% of the 30 who had read the high emotional context crime scene report about murder felt that they were affected by the info given in the report. this is significantly greater in comparison who had read and reported that they were affected by the low emotional context crime scene report about forgery
not all ps read the crime scene report. 57 out of 70 ps indicated that they had read the crime scene report prior to examining the prints. 30 out of the 57 had been in the high emotional condition. 19% of the ps did not read the crime scene report at all
how is hall and player high in population validity
fingerprint experts is the target population
range of experience from experts
how does hall and player lack population validity
all work for MET police
volunteer sampling– biased towards more confident experts
how is hall and player high in ecological validity
they were given what experts are normally given eg 10 print finger form, examination report ,sheet of paper advising of the contents and the mark. also given a magnifying glass and russel comparator which they would usually use.
how is hall and player low in ecological validity
experts would not normally be presented with a fingermark on card
they were not allowed to discuss the fingerprints with coworkers
how did hall and player reduce demand characteristics
did not declare the full details of the experiment
what are the strategies to reduce bias in the collection and processing of forensic evidence?
fingerprint ‘line-ups’
blind testing
sequential unmasking
what are fingerprint ‘lineups’
this involves providing fingerprint analysts with similar multiple possible comparisons (including fillers and possible matches)– as opposed to just latent fingerprints and the ones matched on the computer
the examiner would then be working more blind to the information about which fingerprint may belong to the suspect
what is blind testing
fingerprint experts should not be aware of any information about the crime and unaware of the person who has previously also examined the prints
this strategy attempts to remove as many top down processes as possible
what is sequential unmasking
the examiner has information revealed to them as and when they need it– only when necessary so that the examiners only receive the information they need to conduct their forensic testing