Forensic Psychology Flashcards
2 Biological Explanations
- Atavistic form
- Genetic and neural explanations
3 Genetic Explanations
- Twin and adoption studies
- Candidate genes
- Diathesis-stress model
Twin Study - Christiansen - 6 Points
- Studied over 3,500 twin pairs in Denmark
- Found concordance rates for offender behaviour of 35% for identical twin males and 13% for non-identical twin males
- Slightly lower rates for females
- Included all twins born between 1880 and 1910 in a region of Denmark
- Offender behaviour was checked against Danish police records
- Data indicates that its not just the behaviour that might be inherited but the underlying predisposing traits as well
Adoption Study - Crowe - 2 Points
- Found that adopted children whose biological mother had a criminal record had a 50% risk of having a criminal record by 18
- Adopted children whose biological mother did not have a criminal record only had a 5% risk
Candidate Genes - 4 Points
- Tiihonen et al - genetic analysis of almost 800 Finnish offenders suggested that two genes, MAOA and CDH13, may be associated with violent crimes
- MAOA gene regulates serotonin in the brain and has been linked to aggressive behaviour
- CDH13 gene has been linked to substance abuse and ADHD
- Analysis found that about 5 - 10 % of all severe violent crime in Finland is attributable to these two genotypes
Diathesis - Stress Model - 2 Points
- If genetics do have some influence on offending, it seems likely that this is at least partly moderated by the effects of the environment
- A tendency towards offending behaviour may come about through the combination of genetic predisposition and biological or psychological trigger
2 Neural Explanations
- Prefrontal cortex
- Mirror neurons
Prefrontal Cortex - 4 Points
- Raine - conduced many studies of the APD brain
- Reported that there are several dozen brain-imaging studies demonstrating that individuals with antisocial personalities have reduced activity in the prefrontal cortex
- Part of the brain that regulates emotional behaviour
- Raine and his colleagues found an 11% reduction in the volume of grey matter in the prefrontal cortex of people with APD compared to controls
What is APD?
Anti-social personality disorder, formerly known as psychopathy
Mirror Neurons - 3 Points
- Recent research suggests offenders with APD can experience empathy, but they do so more sporadically than the rest of us
- Keysers - found that only when they were asked to emphasise with a person depicted on film experiencing pain, did their empathy reaction activate, controlled by mirror neurons
- Suggests that APD individuals are not totally without empathy, but may ave a neural ‘switch’ that can be turned on and off, unlike the ‘normal’ brain, which has the empathy switch permanently on
Genetic Explanation of Criminal Behaviour A03 - Issues with Twin Evidence - 5 Points
- Often assumed that the twins grew up in equal environments
- Assumed by researchers studying twins that environmental factors are held constant because twins are brought up together and must experience similar environments
- This ‘shared environment assumption’ may apply more to MZ twins than DZ twins
- MZ twins look identical and people tend to treat them more similarly, which in turn, affects their behaviour
- Higher concordance rates for MZs in twin studies may simply be because they are treated much more similarly than DZ twins
Genetic Explanation of Criminal Behaviour A03 - Support for Diathesis - Stress - 6 Points
- Mednick et al - study of 13,000 Danish adoptees
- When the biological and adoptive parents didn’t have any convictions, the percentage of adoptees that did was 13.5%
- 20% when either of the biological parents had convictions
- 24.5% when both biological and adoptive parents had convictions
- Shows that genetic inheritance plays an important role in offending, but environmental influence is clearly important as well
- Provides support for diathesis-stress model of crime
Genetic Explanation of Criminal Behaviour A03 - Nature and Nurture - 4 Points
- Presumed that adoption studies are a good way of separating nature and nurture
- If crime has a genetic component, then an adopted child should still experience the influence of the biological parent
- However, many adoptions take place when the child is older, so they spend several years with their biological parents
- Many adoptees are also encouraged maintain contact with their biological family, so biological parents may still exert an environmental influence
Neural Explanation of Criminal Behaviour A03 - Brain Evidence - 5 Points
- Support for the link between crime and the frontal lobe
- Kandel and Freed - reviewed evidence of frontal lobe damage, including the prefrontal cortex, and anti-social behaviour
- People with such damage tended to show impulsive behaviour, emotional instability, and an inability to learn from their mistakes
- Frontal lobe is associated with planning behaviour
- Supports the idea that brain damage may be a casual factor in offending behaviour
Neural Explanation of Criminal Behaviour A03 - Intervening Variables - 5 Points
- The link between neural differences and APD may be more complex and other factors may contribute to APD and offending behaviour
- Farrington et al - studied a group of men who scored highly on psychopathy
- These individuals had experienced various risk factors during childhood, such as being raised by a convicted parent and being physically neglected
- Could be that these early childhood experiences caused APD and some of the neural differences associated with it, such as reduced activity in the frontal lobe from trauma - Rauch et al
- Suggests the relationship between neural differences, APD and offending is complex, and there may be other intervening variables that have an impact
Neural Explanation of Criminal Behaviour A03 - Biological Determinism - 5 Points
- Biological approach suggests that offending behaviour is determined by genetic or neural factors which cannot be controlled by the person
- Suggests a person should not be held responsible for a crime
- Our justice system is based on the notion that we have responsibility for our actions
- Only in extreme cases is an individual judged to lack responsibility
- The identification of possible biological precursors to crime complicates this principle
4 Psychological Explanations
- Eysenck’s theory
- Cognitive
- Differential association theory
- Psychodynamic
Definition of the Criminal Personality
A feature of Eysenck’s theory of crime, where an individual who scores highly on measures of extraversion, neuroticism, and psychoticism, and cannot be easily conditioned and is cold and unfeeling, is likely to engage in offending behaviour
Personality Theory - 3 Points
- Eysenck proposed that behaviour could be represented along two dimensions - introversion - extraversion and neuroticism - stability
- Two dimensions combined to form a variety of personality characteristics or traits
- Later added a third dimension - psychoticism - - sociability
Biological Basis of Personality Theory
According to Eysenck, our personality traits are biological in origin and come about through the type of nervous system we inherit
Extravert - 3 Points
- Have an underactive nervous system, which means they constantly seek excitement, stimulation, and are likely to engage in risk-taking behaviours
- Tend not to condition easily, and do not learn from their mistakes
- Seek more arousal and engage in dangerous activities
Neurotic - 3 Points
- Have a high level of reactivity in the sympathetic nervous system, meaning they respond quickly to threatening situations
- Tend to be nervous, jumpy, over anxious, and their general instability means their behaviours are often difficult to predict
- Unstable and prone to overact to threatening situations
Psychotic - 3 Points
- Suggested to have higher levels of testosterone
- Unemotional and prone to aggression
- Lack empathy
3 Traits Needed for a Criminal Personality
- Extravert
- Neurotic
- Psychotic
Role of Socialisation - 5 Points
- Personality is linked to offending behaviour through socialisation processes
- Saw offending behaviour as developmentally immature, in that it is selfish and concerned with immediate gratification
- Process of socialisation is one in which children are taught to become able to delay gratification and more socially orientated
- Believed that people with high extraversion and neuroticism scores had nervous systems that made them difficult to condition
- As a result, they are less likely to learn anxiety responses to antisocial impulses and would be more likely to act antisocially in situations where the opportunity presented itself
Measuring the Criminal Personality - 2 Points
- Developed the Eysenck Personality Questionnaire (EPQ), which is a form of psychological test that locates respondents along the three dimensions to determine their personality type
- Very important aspect of this theory, as it enabled him to conduct research relating personality variables to other behaviours
Eysneck’s Theory of Offending Behaviour A03 - Research Support and Counterpoint - 7 Points
- Eysenck and Eysenck - compared 2,070 prisoner’s scores on the EPQ with 2,422 controls
- Prisoners recorded higher average scores on measures of extraversion, neuroticism, and psychoticism than controls
- Agrees with predictions of the theory, that offenders rate higher than average across the three dimensions
- CC: Farrington et al - conducted a meta-analysis of relevant studies, and reported that offenders tended to score high on measures of psychoticism, but not for extraversion and neuroticism
- Küsser - inconsistent evidence of differences between introverts and extraverts using EEG measures
- Casts doubt on the physiological basis of Eysenck’s theory
- Means some of the central assumptions of the criminal personality have been challenged
Eysneck’s Theory of Offending Behaviour A03 - Too Simplistic - 5 Points
- Idea that all offending behaviour can be explained by personality traits alone is a limitation
- Moffitt - drew a distinction between offending behaviour that only occurs in adolescence (adolescence limited) and offending behaviour that continues into adulthood (life - course - persistent)
- Argued that personality traits alone were a poor predictor of how long offending behaviour would go on for, in the sense of whether someone is likely to become a ‘career offender’
- Considered persistence in offending behaviour to be the result of a reciprocal process between individual personality traits and environmental reactions to those traits
- Presents a more complex picture than Eysenck suggested, and that the course of offending behaviour is determined by an interaction between personality and the environment
Eysneck’s Theory of Offending Behaviour A03 - Cultural Factors - 6 Points
- Criminal personality may vary according to culture
- Bartol and Holanchock - studied Hispanic and African-American offenders in a maximum security prison in New York
- Researchers divided these offenders into 6 groups based on their offending history and the nature of their offences
- Found that all 6 groups were less extravert than a non-offender control group, whereas this theory would expect them to be more extravert
- Suggested that this was because the sample was a very different cultural group than was investigated by Eysenck
- Casts doubt over how far the criminal personality can be generalised, and suggests it may be a culturally relative concept
Eysneck’s Theory of Offending Behaviour A03 - Measuring Personality - 4 Points
- This theory offers a way to measure personality through the use of a psychological test
- Means we can see how the criminal personality differs from the rest of the population across different dimensions
- Critics have suggested that personal type may not be reducible to a score in this way
- The suggestion is that personality, if it does exist, is too complex and dynamic to be quantified
2 Approaches Offender Profiling
- Top-down approach
- Bottom-up approach
Definition of Offender Profiling
A behavioural and analytical tool that is intended to help investigators accurately predict and profile the characteristics of unknown offenders
Definition of Top-Down Approach
Profiles start with a pre-established typology and work down to lower levels, in order assign offenders to one of two categories, based on witness accounts and evidence from the crime scene
Definition of Organised Offender
An offender who shows evidence of planning, targets a specific victim, and tends to be socially and sexually component, with higher than average intelligence.
Definition of Disorganised Offender
An offender who shows little evidence of planning, leaves clues, and tends to be socially and sexually incompetent, with a lower than average intelligence
Top-Down Approach - 5 Points
- Developed by the FBI’s Behavioural Sciences Unit in the 1970s, who drew upon data gathered from in-depth interviews with 36 sexually motivated murderers
- Concluded that the data could be categorised into organised or disorganised crimes
- Each category has certain characteristics which meant that future crime scene data could match one of the categories, and suggest other likely characteristics
- Could then be used to identify the offender or predict their next moves
- Profilers who use this methods will collect data about a murderer, and then decide on the category the data best fits
Organised Offenders - 6 Points
- Show evidence of having planned the crime in advance
- Victim is deliberately targeted, which suggests that the offender has a preferred type of victim they seek out
- Maintains a high degree of control during the crime, and may operate with more precision
- Little evidence or clues left behind at the scene
- Tend to be of above average intelligence, in a skilled and professional occupation, and are socially and sexually competent
- Usually married and may have children
Disorganised Offenders - 6 Points
- Show little evidence of planning, suggesting they may be spontaneous attacks
- Crime scene tends to reflect the impulsive nature of the attack - the body is usually still at the scene, and the offender appears to have had very little control
- Tend to have lower than average intelligence
- Unskilled work or unemployed
- History of sexual dysfunction and failed relationships
- Tend to live alone, and often relatively close to where the offence took place
16 Traits of Organised Offenders
- Average to high intelligence
- Plans offences
- Weapon is usually hidden
- Body is usually transported from the scene
- Careful to cover tracks and leaves few or no clues
- Attempts to control victim
- Sexually competent
- Angry or depressed at the time of the murder
- Socially competent
- Uses restraints on victims
- Victim is specially targeted
- Show self-control at scene
- Victim is likely to be a stranger
- Skilled occupation
- Married or cohabitating
- Likely to follow the story in the media
15 Traits of Disorganised Offenders
- Below average intelligence
- Unskilled occupation or unemployed
- May perform sexual acts post-mortem
- Offender is messy, and makes no effort to conceal evidence so is likely to leave more clues
- First or last born
- Frightened and confused at time of murder
- Socially incompetent
- Minimal use of restraints
- Leaves body on display
- Victim is likely to be random
- Often familiar with the crime scene
- Unplanned and haphazard
- More likely to be known to the victim
- Sexual problems in relation to the mother and/or abuse
- Lives alone
Constructing an FBI Profile - 6 Points
- Proposed by Jackson and Bekerian
- Four main stages
- Data assimilation - profiler reviews the evidence, such as crime scene photos, pathology reports, witness reports, etc
- Crime scene classification - either organised or disorganised
- Crime reconstruction - hypotheses in terms of the sequence of events, victim behaviour, etc
- Profile generation - hypotheses related to the likely offender, such as demographic background, physical characteristics, behaviour, etc
Top-Down Approach To Offender Profiling A03 - Research Support - 4 Points
- Canter et al - conducted an analysis of 100 US murders, each committed by a different serial killer
- Smallest space analysis was used to assess the co-occurrence of 39 aspects of serial murders, and included whether there was torture or restraint, whether there was an attempt to conceal the body, the form of murder weapon used, and cause of death
- Revealed that there does seem to be a subset of features of many serial killings, which matched the FBI’s typology for organised offenders
- Suggests that a key component of this approach to offender profiling has some validity
Smallest Space Analysis
A statistical technique that identifies correlations across different samples of behaviour
Top-Down Approach To Offender Profiling A03 - Counterpoint - 5 Points
- Many studies suggest the organised and disorganised types are not mutually exclusive
- Variety of combinations that occur at any given murder scene
- Godwin - argues that it is difficult to classify killers as one type or another
- A killer may have multiple contrasting characteristics, such as high intelligence and sexual competence, but commits a spontaneous murder and leaves the body at the scene
- Suggests that the organised - disorganised typology is probably more of a spectrum
Top-Down Approach To Offender Profiling A03 - Wider Applications - 5 Points
- Meketa - reports that top-down profiling has been applied to burglary, leading to an 85% rise in solved cases on 3 US states
- Retains the organised - disorganised distinction, but adds 2 new categories - interpersonal and opportunistic
- Interpersonal - offender usually knows their victim and steals something of significance
- Opportunistic - generally an inexperienced young offender
- Suggests that top-down profiling has wider applications than was originally assumed
Top-Down Approach To Offender Profiling A03 - Flawed Evidence - 5 Points
- Of the 36 murderers interviewed, 25 were serial killers and 11 were single or double murderers
- At the end of the interview process, 24 were classified as organised and 12 were classified as disorganised
- Canter et al - argued that the sample was poor, as the agents did not select a random or large enough sample to include different kinds of offenders
- No standard set of questions, so each interview as different and not really comparable
- Suggests this type of profiling does not have a strong scientific basis
Top-Down Approach To Offender Profiling A03 - Personality - 4 Points
- Based on the principle of behavioural consistency, where serial offenders have characteristic ‘modus operandi’
- These should be seen across all their crime scenes, which should allow the profiler to link different crime scenes together, making the offender easier to catch
- Situationist psychologists, such as Mischel, argue that people’s behaviour is more driven by the situation they are in, than their criminal ‘personality’
- Behavioural patterns seen at a crime scene may tell us little about how the individual behaves in everyday life
Definition of the Bottom-Up Approach
Profilers work up from evidence collected from the crime scene to develop hypotheses about the likely characteristics, motivations, and social background of the offender
Which Offender Profiling Approach is American in Origin?
Top-down
Which Offender Profiling Approach is British in Origin?
Bottom-down
Definition of Investigative Psychology
A from of bottom-up profiling that matches details from the crime sene with statistical analysis of typical offender behaviour patterns, based on psychological theory
Definition of Geographical Profiling
A form of bottom-up profiling based on the principle of spatial consistency, where an offender’s operational base and possible future offences are revealed by the geographical location of their previous crimes
Bottom-Up Approach - 4 Points
- Aim is generate a picture of an offender, such as their likely characteristics, routine behaviour, and social background, through systematic analysis of evidence at the crime scene
- Does not begin with a fixed typology
- Profile is data driven, and emerges as the investigator engages in deeper and more rigorous scrutiny of the details of the offence
- Much more grounded in psychological theory than the top-down approach
2 Forms of the Bottom-Up Approach
- Investigative psychology
- Geographical profiling
Investigative Psychology - 4 Points
- Aim is to establish patterns of behaviour that are likely to occur or co-exist across crime scenes, in order to develop a statistical database, which can then establish a baseline for comparison
- Specific details of an offence or related offences can then be matched against this database to reveal important details about the offender, their personal history, family background, etc
- May also determine whether a series of offences are linked and are likely to have been committed by the same person
- 3 main variables - interpersonal coherence, significance of time and place, and forensic awareness
Interpersonal Coherence - 2 Points
- The way an offender behaves at the scene and interacts with the victim, which may reflect their behaviour in everyday situations
- Dywer - some rapists want to maintain maximum control and humiliate their victims, whilst some are more apologetic, which could give the police some insight into how the offender relates to women more generally
Significance of Time and Place
May indicate where the offender lives or works
Forensic Awareness - 2 Points
- Describes these individuals who have been the subject of police interrogation before
- Their behaviour might reveal how mindful they are of ‘covering their tracks’
Geographic Profiling - 6 Points
- Uses information about the location of linked crime scenes to make inferences about the likely home or operational base of an offender
- Known as ‘crime mapping’ and is based on the principle of spatial consistency
- Can be used alongside investigative psychology to create hypotheses about how the offender is thinking and their modus operandi
- The assumption is that serial offenders will restrict themselves to geographical areas they are familiar with
- By understanding the spatial pattern of their behaviours, it provides investigators with a ‘centre of gravity’, which is likely to include the offender’s base that is often in the middle of the spatial pattern
- Basis of Canter’s ‘circle theory’
Spatial Consistency
People commit crimes within a limited geographical space
Canter’s Circle Theory - 5 Points
- Proposed by Canter and Larkin
- The pattern of offending behaviour forms a circle around the offender’s home base
- Distribution leads us to describe an offender as either a marauder or a commuter
- A marauder operates in close proximity to their home base
- A commuter is likely to have travelled a distance away from their usual residence
Bottom-Up Approach To Offender Profiling A03 - Evidence for Investigative Psychology - 4 Points
- Canter and Heritage - conducted an analysis of 66 sexual assault cases
- Data was examined using smallest space analysis, and several behaviours were identified as common in different samples of behaviour, such as the use of impersonal language and the lack of reaction to the victim
- Each individual displayed a characteristic pattern of similar behaviours, and this can help establish whether two or more offences were committed by the same person - ‘case linkage’
- Supports one of the basic principles of investigative psychology and the bottom up approach, suggesting people are consistent in their behaviour
Bottom-Up Approach To Offender Profiling A03 - Counterpoint - 4 Points
- Case linkage depends on the data base and will only consist of past crimes that have been solved
- May have been solved because it was relatively straightforward to link these crimes together in the first place
- Makes this a circular argument
- Suggests investigative psychology may tell us little about crimes that have few links between them, and they may remain unsolved
Bottom-Up Approach To Offender Profiling A03 - Evidence for Geographic Profiling - 6 Points
- Lundrigan and Canter - collected information from 120 murder cases, including serial killers, in the US
- Smallest space analysis revealed spatial consistency in the behaviour of the killers
- The location of each body disposal site created a centre of gravity, presumably because the offenders start from their home base and may go in a different direction each time they dispose of a body, but in the end these all create a circular effect around their home base
- The offender’s base was almost always in the centre of the pattern
- The effect was more noticeable for marauder offenders, who travelled short distances
- Supports the view that geographical information can be used to identify an offender
Bottom-Up Approach To Offender Profiling A03 - Geographical Information Inefficient - 5 Points
- The success of geographical profiling may be reliant on the quantity of data that the police can provide
- Crime recording isn’t always accurate, can vary between police forces, and an estimated 75% of crimes are not even reported in the first place
- Calls into question the utility of the approach that relies on the accuracy of geographical data
- Even if this information is correct, critics ( like Ainsworth) claim that other factors are just as important in creating a profile, such as timing of the offence and the age and experience of the offender
- Suggests geographical information alone may not always lead to the successful capture of an offender
Offender Profiling A03 - Mixed Results - 4 Points
- Copson - surveyed 48 police departments, and found that the advice provided by the profiler who was judged to be ‘useful’ in 83% of cases
- Suggests its a valid investigative tool
- Also revealed that it lead to an accurate identification of the offender in 3% of cases
- Kocsis et al - found that chemistry students produced more accurate offender profiles on a solved murder case than experienced senior detectives
Definition of the Atavistic Form
A biological approach to offending that attributes criminal activity to the fact that offenders are ‘genetic throwbacks’ or a primitive sub-species ill-suited to conforming to the rules of modern society, indicated by particular facial and cranial characteristics
Lombroso - 4 Points
- Italian physician who wrote a book called ‘L’ Uomo Delinquente’ (‘The Criminal Mind’) in 1876
- Suggested that criminals were genetic ‘throwbacks’ - a primitive sub-species who were biologically different from non-criminals
- Examined the facial and cranial features of 383 dead convicts and 3839 living ones, all Italian
- Concluded 40% of criminal acts are committed by people with atavistic characteristics
Biological Basis of the Atavistic Form - 3 Points
- Offenders are seen as lacking evolutionary development, as their savage and untamed nature meant that they would find it impossible to adjust to the demands of civilised society, and would inevitably turn to crime
- Saw offending behaviour as a natural tendency, rooted in the genes of those who engage in it
- Proposed a new perspective - offending behaviour was innate and an offender was not to blame for their actions
Atavistic Features of Criminals - 10 Points
- Strong and prominent jaw
- High cheekbones
- Dark skin
- Extra toes, nipples, or fingers
- Heavy brow
- Large ears
- Unemployed
- Tattoos
- Use of criminal slang
- Insensitivity to pain