3.4 forensic psychology Flashcards
offender profiling
offender profiling is a tool employed by the police to narrow down the list of likely suspects.
it suggests that the characteristics of the offender can be deduced from details of the offence and crime scene.
profiling methods vary, but usually involve careful scrutiny of the crime scene and analysis of evidence (including witness reports). this is in order to generate a hypothesis about the probable characteristics of the offender (age, background, occupation etc.)
top-down approach
profilers have pre-existing labels of ‘organised offender’ and ‘disorganised offender’ in their minds.
evidence from the crime scene and other details of the crime/victim/context are then used to fit the offender into either category (as one type or the other).
organised offenders
P - shows evidence of PLANNING the crime in advance
T - killer/rapist TARGETS their victim deliberately and often has a preference
C - maintains a high level of CONTROL during their crime and operates with an almost detached surgical precision
I - above average INTELLIGENCE, in a skilled/professional occupation. little evidence is left at the crime scene
S - socially and SEXUALLY competent. usually married and have children
disorganised offender
P - shows little evidence of PLANNING the crime in advance, spontaneous
T - the crime scene often reflects the impulsive nature of the attack, mostly UNTARGETED.
C - body often left at the scene, appears to have been very little CONTROL on the offenders part
I - lower than average INTELLIGENCE usually, in unskilled work/unemployed
S - history of SEXUAL dysfunction or failed relationships. tend to live alone and relatively close to where the offence took place
four weaknesses of the top-down approach
- top-down profiling only applies to certain crimes (eg. rape, arson, cult killings, murders that involve macabre practices). common offences like burglary do not lend themselves to top-down profiling because the crime scene reveals little about the offender.
- the organised/disorganised distinction was developed based on interviews with 36 sexually motivated serial killers in the US, including ted bundy and charles manson. this is too small a sample size and too unrepresentative to base a typology system on. canter (2004) also argued that it’s not valid to rely on self report data from convicted serial killers when constructing a classification system.
- canter (2004) analysed data from 100 murders in the USA with reference to the characteristics thought to be typical of organised and disorganised killers. the findings did suggest evidence of a distinct organised type but not disorganised, which undermines the entire classification system.
- organised/disorganised is too simplistic. holmes (1989) suggested that there’s 4 types of serial killer: visionary SK (kill because god/the devil is directing them to), mission SK (kill to eradicate a group of people they consider undesirable), hedonistic SK (kill for the thrill) and power SK (kill to have complete control of their victims)
bottom-up approach
the approach was developed in the UK. unlike the top down approach, the bottom up does not begin with fixed typologies.
the aim is to generate a picture of the offender, including their likely characteristics, routine behaviour and social background.
the profile is data-driven and the profiler systematically analyses the features of the crime in heavy detail. it’s more grounded in psychological theory than the top-down.
investigative psychology
investigative psychology aims to establish behaviours that are likely to occur at certain crime scenes. this is done to create a statistical database which then acts as a baseline for comparison.
specific details of an offence can then be matched against this database to reveal statistically probable details about the offender (their personal history, family background etc.).
this can also help determine whether multiple offences are linked and likely to have been committed by the same individual.
interpersonal coherence
central to investigative psychology is the concept of interpersonal coherence.
how an offender behaves at the crime scene,including how they interact with the victim, may reflect their behaviour in everyday situations. eg. whilst some rapists want to control and humiliate their victim, others can be apologetic. this might tell the police how the offender relates to women more generally.
forensic awareness
forensic awareness describes individuals who have made an attempt to ‘cover their tracks’ (i.e. hide the body/murder weapon or clean the crime scene).
their behaviour may indicate that they have been the subject of police interrogation in the past, or even that the police already have their DNA or fingerprints on file.
geographical profiling
the significance of time and place of the crime is also a key variable and may indicate where the offender lives.
geographical profiling focuses on the location of the crime as a clue to where the offender lives, works and socialises (could be by using relevant data from the geographical spread of similar crimes, transport links and local crime stats)
the assumption is that a serious offender will restrict their criminal activities to an area that they are familiar with, and the offender’s base will therefore be in the middle of the spatial pattern of their crime scenes. earlier crimes are likely to be closer to the offender’s base than later, and as the offender gains confidence they will travel further from their comfort zone.
canter and larkin (1993)
canter and larkin (1993) propose two models of offender behaviour: the marauder (who operates close to their home) and the commuter (who is likely to have travelled a distance away from their home).
the spatial pattern of a crime will still form a circle around the offenders base either way - this becomes more apparent as more offences are committed.
it can also tell the police whether the crime was planned or opportunistic, as well as other important facts about the offender such as their mode of transport, employment status, approximate age, etc
two strengths of the bottom up approach
+ canter argues that bottom-up profiling is more scientific than top-down profiling because it is more grounded in evidence and psychological theory and less driven by speculation and hunches than top-down profiling.
+ bottom-up profiling, unlike top-down profiling, can be applied to a wide variety of offences, such as burglary and theft, as well as murder and rape. this is because the top down approach focuses on the crime scene rather than characteristics of the offender, like the bottom up approach does.
two weakness of the bottom-up approach
- copson (1995) surveyed 48 police forces and found that the advice provided by a profiler was judged to be useful in 83% of cases, but only led to the accurate identification of the offender 3% of the time. this shows the approach may not be as useful practically as theorised.
- kocsis et al. (2002) found that chemistry students produced a more accurate offender profile than experienced senior detectives. this implies that the bottom-up approach is essentially common sense and guess work, undermining its validity.
historical explanations to offending
cesare lombroso (1876) suggested criminals were a primitive subspecies who were biologically different to non-criminals. this laid the foundation for offender profiling.
criminals were seen as lacking evolutionary development meaning they would find it impossible to adjust to society so turn to crime
atavistic form
lombroso argued that the criminals could be identified through a set of physiological characteristics that were linked to particular crime.
these were mainly features on the face and head and were biologically determined atavistic characteristics. this showed that criminals were physically different from the rest of us.
examples include: narrow, sloping brow, a strong prominent jaw, high cheekbones, facial asymmetry; dark skin, extra toes/nipples/fingers
atavistic characteristics were specialised
murderers: bloodshot eyes, curly hair and long ears
sexual deviants: glinting eyes, swollen/fleshy lips and projecting ears
fraudsters: lips that are thin and ‘reedy’
other traits beside physical
lombroso suggested that other characteristics of those born criminal were: insensitivity to pain, use of criminal slang, tattoos and unemployment
two strengths of the atavistic form
+ the atavistic form had an important role in the shift away from theories based on feeble-mindedness, wickedness, and demonic possession. it was the forerunner to more biological explanations (evolutionary influences and genetics).
+ lombroso meticulously examined the facial and cranial features of italian convicts, both living and dead. he proposed that the atavistic form was associated with a number of physical anomalies which were key indicators of criminality. in total, lombroso examined the skulls of 383 dead criminals and 3839 living ones, and concluded that 40% of criminal acts could be accounted for by the criminal subculture.
three weaknesses of the atavistic form
- several critics have drawn attention to the distinct racist undertones in lombroso’s work. many of the features he described as atavistic (e.g. dark skin and curly hair) are most likely to be found in people of african descent. his claim that atavistic characteristics were uncivilized, savage and primitive supported the eugenic philosophy.
- lombroso did not compare his criminal sample to a non-criminal control group. if he had done then the differences he reported may have disappeared. goring (1913) compared 3,000 criminals with 3,000 non-criminals to establish any physical/mental abnormalities between them. he found no evidence that offenders had particular facial and cranial characteristics. however, he did suggest that criminals are more likely to have a below-average intelligence.
- even if criminals have atavistic characteristics this not necessarily mean that these characteristics cause their criminal behaviour. facial and cranial features can be influenced by poverty and poor diet, which can also lead people to crime.
genetic explanations to offending
genetic explanations for crime suggest that would-be offenders inherit a gene/combination of genes, that predisposes them to commit crime.
lange (1930)
lange (1930) investigated 13 monozygotic (identical) twins and 17 dizygotic (non-identical) twins. at least one of the twins in each pair had served time in prison.
10/13 MZ twins had both spent time in prison, compared to only 2/17 DZ twins.
as concordance rates for both going to prison were higher in MZ twins, this shows that genetics may have had an impact on criminal behaviour. the twins with 100% of the same genes were more likely to both commit crimes than those with 50% of the same DNA.
tilhonen (2014)
criminal behaviour could be polygenic, meaning one gene specifically is not responsible for offending, but many candidate genes might be.
tilhonen et al (2014) conducted a genetic analysis of over 900 finnish offenders which revealed abnormalities in two genes that may be associated with violent crime.
- the MAOA gene - controls dopamine and serotonin in the brain and has been linked to aggressive behaviour.
- the CDH13 gene - linked to substance abuse and attention deficit disorder.
the finnish sample individuals with this high-risk combination of genes were 13 times more likely to have a history of violent behaviour compared to a control group.
diathesis-stress model
the diathesis-stress model holds that genetics influence criminal behaviour but this is moderated by the effects of the environment.
a tendency towards criminal behaviour may come through a combination of genetic predisposition and biological or psychological triggers, such as being raised in a dysfunctional environment.
neural explanations
evidence suggests that there may be neural differences in the brains of criminals compared with non-criminals.
most evidence in this area uses individuals diagnosed with APD, (reduced emotional responses, lack of empathy). this condition that characterises many convicted criminals.
many brain imaging studies have shown that individuals with APD have reduced activity in the pre-frontal cortex, which is the area that regulates emotional behaviour.
keysers (2011)
recent research has suggested that criminals with APD can experience empathy, but more sporadically than others.
keysers et al. (2011) found that only when criminals were asked to empathise with a person on a film experiencing pain, did their empathy reaction activate. this is controlled by mirror neurons in the brain.
this suggests that APD individuals can’t not experience empathy, but may need a neural switch on to do so. healthy brains have the ‘empathy switch’ permanently on.
two strengths of genetic/neural explanations
+ raine et al. (2000) found an 11% reduction in the volume of grey matter in the prefrontal cortex (regulates emotional behaviour) of people with APD compared to a control group. this supports the idea that APD individuals are neurally different to others. however, these brain scanning studies show pathology in brains of criminal psychopaths, but cannot conclude whether this is genetic or signs of early abuse.
four weakness of genetic/neural explanations
- concordance rates in MZ twins are never 100%, meaning genetics cannot be the only explanation for criminal behaviour. behaviour may be due to other external factors such as shared learning experiences (environment) alongside/instead of genetics.
- the term ‘offending behaviour’ is too vague. some specific forms of crime may be more biological than others e.g. physical aggression and the MAOA gene.
- the genetic and neural explanation of criminal behaviour is also an example of biological determinism. this presents us with a dilemma for our legal system. if someone has a criminal gene they cannot have personal and moral responsibility for their crime. if this is the case it would be unethical to punish someone who does not have free will.
- it is biologically reductionist. criminality is complex, so explanations that reduce offending behaviour to an inherited gene or imbalanced neurotransmitter may be inappropriate and overly simplistic. criminal behaviour does seem to run in families, but so does emotional instability, mental illness, social deprivation and poverty which may all be factors that contribute to offending in the future.
eysenck’s criminal personality (1947)
eysenck (1947) proposed that behaviour could be represented along two dimensions: introversion/extraversion and neuroticism/stability, which combine to form a variety of personality traits. eysenck later added a third dimension - psychoticism.
he suggested our personality traits have an innate biological origin, based on the type of nervous system we inherit from our parents.
this includes the criminal personality type, which includes all characteristics and behaviour from the neurotic-extravert categories. eysenck suggested a typical offender will also score highly on psychoticism - cold, unemotional and prone to aggression.
extraverts and neuroticists
extraverts have an underactive nervous system so they are constantly seeking excitement, and stimulation, and may engage in risk-taking behaviour. they are difficult to condition and so do not learn from their mistakes.
neurotic individuals tend to be nervous, jumpy and over-anxious, and their general instability means their behaviour is often difficult to predict.
personality and socialisation
in eysenck’s theory, personality is linked to criminal behaviour via socialisation. he saw criminal behaviour as developmentally immature in that it is selfish and concerned with immediate gratification.
during socialisation, children are taught to delay gratification and be socially orientated. eysenck believed that people with high extraversion and neuroticism scores had nervous systems that made them difficult to condition.
as a result they will not learn easily to respond to their anti-social impulses with anxiety and are more likely to act antisocially in situations where the opportunity presents itself.
strength of eysenck’s criminal personality
+ eysenck developed the ‘eysenck personality inventory’, a psychological test which locates respondents along the extraversion and neuroticism dimensions to determine their personality type. a later scale was introduced that is used to measure psychoticism. therefore the personality theory is measurable and scientific.
four weakness of eysenck’s criminal personality
- eysenck’s theory is out of step with modern personality theory. digman’s (1990) five factor model of personality suggests that openness, agreeableness and conscientiousness are important personality dimensions, in addition to extraversion and neuroticism. using this model multiple combinations are available.
- the idea that all offending behaviour can be explained by a single personality type has been heavily criticised as being simplistic. crime is too varied and complex a behaviour to be due to one single personality type (eg. one who commits murder is likely very different to fraud). also personality itself cannot be reduced to a score on a psychological test like eysenck suggests. critics believe there is no such thing as ‘stable personality’ as this changes daily depending on the situation/context.
- farrington et al. (1982) reviewed several studies and reported that offenders tended to score higher on psychoticism, but NOT on extraversion and neuroticism, than non-offenders. this undermines the entire personality theory
- bartol and holanchock (1979) looked into cultural differences. they studied hispanic and african-american offenders in a maximum security prison in new york. they were divided 6 groups based on their criminal history and the nature of their offences. all 6 were less extraverted than non-criminal control groups. this means eysenck’s theory could be culturally biased.
cognitive explanations of offending
moral reasoning and cognitive distortions