Forensic Psychology Flashcards
top down
What is offender profiling
A tool used by police when solving crimes- with the main aim being to narrow down the field of enquiry and make a list of suspects by looking at the crime scene and evidence
top down
What is the top down approach
Originated from FBI
Used to solve the most severe violent cases by interviewing most serious sexually motivated killers including ted bundy and Charles Manson
Also referred to as ‘typology’ as offenders are organised into organised or disorganised offender categories
top down
What are characteristics LH organised offenders
Plan crime in advance
Precision
Highly controlled
Lack of evidence
Usually married
Socially sound
Above average intelligence
top down
What are some traits of disorganised offenders
Lack of planning
Evidence left
Low iq
Socially awkward
Usually unemployed
Little interest in crime
top down
What are the four main stages of constructing an FBI profile
Data assimilation- evidence is reviewed
Crime scene classification- see if organised or disorganised
Crime reconstruction- hypothesis of how crime happened
Profile generation- hypothesis about offender (stature/behaviour)
top down
What are the strengths of the top down approach?
Supporting evidence- Canter looked at 100 US serial killings by using a ‘smallest space analysis’ which matched characteristics to crimes which matched the FBI typologies
Good generalisability- Meketa (2017) found that in 3 US states there has been an increase of 85% in solving burglaries using top down approach. categories of interpersonal and opportunistic made for this
top down
What are the weaknesses of the top down approach
contrast- Godwin argued that many criminals overlapped categories. suggests organised or disorganised typology is more of a continuum
Low internal validity- canter argues that the sample used of 36 serial killers was too niche and they were all interviewed using unstructured interviews so all questions were different and not comparable. all committed at least two murders and 25 committed multiple
bottom up
What is the bottom up approach
‘British approach’
Uses past data from similar crimes to build a picture of an offender. Investigators will look at crime scene and compare to similar ones in the past. Does not use typologies and is ‘data driven’
bottom up
What are the two main components of the bottom up approach
Investigative psychology
Geographical profiling
bottom up
What is investigative psychology
Compare a currently investigated crime scene to those of the past to find out the type of person that committed the crime by establishing patterns of behaviour
bottom up
What are the three main parts of investigative psychology
Interpersonal coherence- the way the offender behaves at the scene and how they ‘interact’ with the victim
Significance of time and place- shows where the offender is living
Forensic awareness- see how mindful they are of covering their tracks, can show if they have been investigated before
bottom up
What is geographical profiling
Based on spatial consistency
An offenders operational base and never crime locations can be discovered through previous crimes
bottom up
What are the three main parts of geographical profiling
Spatial consistency- people commit crimes within a limited space
Crime mapping- maps previous crimes to find base of criminal
Modus operandi- a particular way of method or doing something
bottom up
Wag are the two types of geographical criminal and what does this mean
Marauder- operates close to home base
Commuter- travels distance from usual residence
bottom up
What are the strengths of the bottom up approach
Supporting evidence- Gary Copson surveyed 48 police departments and bottom up approach was deemed useful in 83% of cases
Supporting evidence- Ludigran and Canter investigated 120 murder cases and found that where killers disposed of bodies formed a circle around their home base, this was more noticeable in marauders. supports canters circle theory
bottom up
What are the weaknesses of the bottom up approach
Mixed results- Copson found that bottom up approach lead to identification of offender in only 3% of cases in 48 police departments surveyed
Significant failures- Rachel nickell was killed and sexually assaulted in Wimbledon park. Colin Stagg was suspect and tracked for 5 months. Case closed due to lack of evidence. Robert Napper arrested 16 years later and had been dismissed prior due to being taller than description of killer
historic explanations
What is atavistic from
An early biological explanation which suggests criminals are subspecies or genetic throwbacks. That rate distinguishable by facial and cranial features
historic explanations
What was Lombroso’s research
Studied over 4000 skulls of dead and alive criminals and concluded 40% of crimes could be accounted for by atavistic characteristics
historic explanations
What are some criminal characteristics?
Narrow, sloping brow
High cheekbones
Facial asymmetry
Dark skin
Prominent jaw
Extra toes, nipples and fingers
historic explanations
What is a Strength of atavism
Changed criminal psychology- Hollin described Lombroso as ‘The father of modern criminology’ This was because he moved crime research towards more scientific measures. Also shows links to offender profiling.
historic explanations
What are the limitations of atavistic explanations
Poorly controlled- lombroso did not compare criminal samples with control non criminal sample so he could not control confounding variables, such as class.
Bad implications- Delisl and other critics have shown how there were racist undertones in Lombroso’s work. For example criminals having curly hair and dark skin.
contradictory evidence- Goring studied 3000 criminals and 3000 non crimi9nals and found no correlation between cranial features and crime
biological explanations
What was Lange’s research into genetic explanations for offending
Studied 17 MZ twins and 13 DZ twins where one of the twins had served time in prison.
Found that 10 of the MZ twins and only 2 of the DZ twins had both spent time in prison
biological explanations
What was Christiansen’s research into genetic explanations for offending
Studied over 3500 twins between 1880 and 1910
Found concordance rates of 35% of MZ twins and found 13% for DZ twins
biological explanations
What did Tiihonen discover about candidate genes
Found that 5-10% off all severe violent crimes in Finland could be attributed to the MAOA and CDH13 genes.
Individuals with both genes were 13x more likely to have a history of violent behaviour.
biological explanations
What does the MAOA gene do
MAOA is a chemical that breaks down excess neurotransmitters such as serotonin. If this gene is defective then there will be less serotonin being broken down so there will be an excess which could result in aggression and risk taking
biological explanations
What is the CDH13 gene linked to
ADHD and substance abuse
biological explanations
What is a strength of genetic explanations for offending
Supporting evidence- Mednick studies 13000 Danish adoptees who committed petty offences. Found that if neither biological or adopted parents had a criminal record the percentage of adoptees that did was 13.5%. If one biological parent did this rose to 20% and if one biological and one adopted parents did this rose to 24.5%
biological explanations
What is a weakness off genetic explanations of offending
Lack of validity- MZ twins are more likely to have higher concordance rates because they look the same so are therefore treated notes similarly than DZ twins
biological explanations
What are neutral explanations for offending behaviour
Looking at brain structure and how offenders may differ. Much of these findings come from offenders with antisocial personality disorder.
biological explanations
What is antisocial personality disorder associated with.
Reduced emotional and lack of empathy. Psychopaths are also impulsive, self-centred and manipulative
biological explanations
What did Raine find about APD
Found an 11% reduction in the volume of gray matter in the PFC of people with APD compared to a control group.
PFC regulates emotion
Damage to PFC can result in lack of control over impulses
biological explanations
What did Keysers find about mirror neurons
Asked psychopaths to watch someone on film feel pain
They did not feel empathy until told to
biological explanations
What were the suggestions of Keysners research
Psychopaths are not completely without empathy and can turn it on and off
biological explanations
What is a Strength of neural explanations for offending
Kandel and Freed rescued people with frontal lobe damage including to the PFC. They found evidence for lack of control over impulses and emotional instability, this supports Raine’s study
biological explanations
What are the weaknesses of neural explanations for offending
Intervening variables- Farmington studied a group of men who scored high on a psychopathy test and found many of them had convict parents or were physically neglected
Problematic real world implications- suggests they are hardwired to do crimes so hard to convict
psychological theory (eysenck)
What is Eysneck’s explanation for offending.
Personality can be measured on two dimensions introversion/extroversion and neuroticism/stability. He later added psychotism
psychological theory (eysenck)
What are examples of traits of psychotism, neuroticism and extroversion
Psychotism- aggressive, manipulative
Neuroticism- anxious, low self esteem
Extroversion- sociable, dominant
psychological theory (eysenck)
What did Eysenck say about extroverts, neurotic individuals and psychotic individuals
Extroverts- underactive nervous system, so participate in more risk taking activity
Neurotic individuals- nervous, jumpy, unpredictable
Psychotic individuals- higher levels of testosterone, cold and aggressive
psychological theory (eysenck)
What is a strength of Eysneck’s personality as an explanation for offending
Supporting evidence- Sybil and Hans Eysneck compared 2070 inmates to a control group of 2422 non criminals. They found that the criminal sample scored much higher on psychotism neuroticism and extroversion
psychological theory (eysenck)
Quay are weakness of Eysnecks personality as a theory for offending
Contradictory evidence- Farrington concluded via a meta analysis that offenders scored higher on P but not on N or E. Kussner also said there was very little difference between an introvert and an extrovert on an EEG measurement.
Poor generalisability- Bartol and Holanchock investigated the personalities of Hispanic and African American inmates in a high security prison in New York. They were split into 6 groups depending on their crime and all 6 groups are found to be less extrovert than a non criminal control group
too simplistic- Moffitt suggested that offending in adolescence and offending consistently are different. suggested that if someone is offending through their later life it is due to personality AND environment.
psychological theory (cognitive)
What dilemma did Kohlberg come up with
The Heinz dilemma
psychological theory (cognitive)
What were the findings from the Heinz dilemma
A group of violent youths were much lower in moral development than non violent youths.
psychological theory (cognitive)
What were Kohlberg’s stages of morality
Preconventional Morality
Stage 1- punishment orientation: rules are obeyed to avoid punishment
Stage 2-personal gain orientation- rules are obeyed for personal gain
Conventional morality
Stage 3- good boy orientation: rules are obeyed for approval
Stage 4- maintenance of social order
Postconventional morality
Stage 5- rules obeyed if impartial but challenged if oppressive
Stage 6- individual establishes own set of rules which align with their beliefs
psychological theory (cognitive)
What is a strength of Kohlbergs theory of offending
Supporting evidence- palmer and hollin compared 126 offenders to a control group and found low levels of morality are associated with offending using the Socio moral reflection short form (SMR-SF)