CRIMINAL PSYCHOLOGY Flashcards
(73 cards)
Key research for turning to crime
Raine
Who did Raine study
Criminals convicted of murder or manslaughter, pleading NGRI (not guilty with reason of insanity), compared with matched controls
What was the procedure of Raine
They completed a 32 min continuous performance task before having a PET scan (glucose injection to identify activity)
Raine Results
Less activity in PRE-FRONTAL CORTEX (impulsivity, lack of self control)
AMYGDALA - less activity in the left, more in the right, indicates lack of feeling fear
CORPUS CALLOSUM - less activity = cant grasp long term implications
Raine sample size
41 in each group
4 additional studies unit 1 ( turning to crime, Raine )
Raine
Palmer + hollin
Jahoda
Smoking during pregnancy
Palmer + Hollin
compared 126 male offenders 13-21 to non offenders using the SOCIOMORAL REFLECTION MEASURE - SHORT FORM and the SELF REPORTED DELINQUENCY CHECKLIST
They found SRM-SF showed offenders had lower level of moral reasoning = deficit in moral reasoning
Jahoda
Jahoda studied juvenile delinquency records for a 5 year period,
Monday born boys commit 6.9% of violent offences, Wednesday born boys commit almost 22% of violent offences
Because of SELF FULFILLING PROPHECY
Raine study 2
Studied children from Mauritius, 100 kids received nutrition, exercise, cognitive stimulation. At 17, less hot tempered, lower conduct disorder and less cruel to others.
Follow up = children drank fish oil for 6 months, led to reduction in aggression, delinquency and attention problems
Smoking during pregnancy
smoking during pregnancy = foetus having more exposure to testosterone. Indicated by length of ring finger compared to index. Long ring finger = aggression, lack of empathy, anti social behavior
3 suggestions for unit 1 (turning to crime)
Ensure parents dont smoke, smoking during pregnancy
Implement an intervention early on in childhood, Raine Mauritius programme
Give child supplements, Raine fish oil
What is key research for unit 2 (collecting and processing of forensic evidence)
Hall and Player
hall and player sample
70 fingerprint experts from metropolitan police, mean 11 years experience
Hall and player procedure
Participants had to look at a £50 note with a fingerprint on, deliberately ambiguous. Low emotion group told suspect tried to pay with fake money, high emotion told suspect shot at somebody. Offered crime scene report. Completed a questionnaire of how they came to their decision, if they read it and whether it effected their analysis.
4 options participant could choose in Hall and Player
1) the fingerprints matched
2) they didn’t match
3) there wasn’t enough detail to analyse or
4) some agreement but not enough to make a definitive match.
Hall and player results
57/70 had read the crime scene report.
52% of those in the high emotional context believed it had affected their decision, while 6% of those in the low emotional context believed it had affected their decision.
Even though the experts thought their decision had been affected, it hadn’t been as no significant difference was found between the two groups
4 additional studies topic 2 (forensics, hall and player)
Dror 2012
Dror 2005
LSU
Miller
Dror 2012
BOTTOM UP (examine print, identify unique features to make a match) vs TOP DOWN (uses experience + knowledge tp make an assumption about print identity. Used when print is unclear)
Top down = more open to mistakes (ie expectancy bias, selective attention)
Dror 2005
27 students, non fingerprint experts, given 96 pairs of prints. Half easy to match, half ambiguous.
High emotional cases found a match 58% of the time, compared to 49% in the low emotional cases.
Suggests that an emotional context influences fingerprint analysis. However, non experts
Linear Sequential Unmasking (LSE)
- Analyse the crime scene print ON IT’S OWN while looking for and recording any unique features and deciding if there is enough detail to make a comparison – without any additional information about the crime
- Later, extra information will then be given in order of importance to the case to help make a comparison (e.g. case report about the type of crime and it’s complexity)
- The expert can then revisit and add to their analysis but cannot delete or make changes to initial interpretations. They can also say how confident they are in saying it is a match or not
Miller
Looked at hair samples, given one hair from the crime and 6 samples to compare against, 5 are fillers. Experts know most hairs not from suspect = experts are more careful when matching hairs
3 Suggestions for unit 2 (forensics)
1) limit info available - about the case, dror found high emotion cases increased number of matches from 49% to 58%
2) use a lineup of other samples, miller suggest 6 pack idea
3) be aware of ‘top down’ cognitive biases. Dror found mistakes from top down, relies on assumptions
Key research topic 4 (psychology and the courtroom)
Dixon et al
Dixon et al sample
University College Worcester students (no-one from Birmingham)