Paper 3 - Forensic Psychology Flashcards
Define Offender profiling
Offender profiling is based on the idea that the characteristics of an offender can be deduced from the characteristics of the offence and the particulars of the crime scene
Outline Offender profiling
The main aim of offender profiling is to narrow the field of enquiry and the list of likely suspects. Methods vary, but the compiling of a profile will usually involve careful scrutiny of the crime scene and analysis of the evidence (including witness reports) in order to generate hypotheses about the probable characteristics of the offender (their age, background, occupation, etc). There are two main types of offender profiling: Top-down approach and Bottom-up approach.
Outline the top down approach
The top-down approach to offender profiling originated in the United States as a result of work carried out by the FBI in the 1970’s. More specifically, the FBI’s Behavioural Science Unit drew upon data gathered from in-depth interviews with 36 sexually motivated serial killers including Ted Bundy and Charles Manson. Profilers who use this method will match what is known about the crime and the offender to a pre-existing template
that the FBI developed using the data they gathered from
the interviews they conducted. Murderers or rapists are
classified in one of two categories (organised or
disorganised) on the basis of the evidence, and this
classification informs the subsequent police investigation.
Outline the difference between organised and disorganised offenders
The distinction between organised and disorganised offenders is based on the idea that serious offenders have a particular way of ‘working’ (this is referred to as modus operandi – MO) and that these generally correlate with a particular set of social and psychological characteristics that relate to the individual.
Outline the characteristics of organised offenders
Ted Bundy – organized offender
- Shows evidence of having planned the crime in advance
- The victim is deliberately targeted and will often reflect the fact that the killer or rapist has a ‘type’.
- They maintain a high level of control during the crime and may operate with almost detached surgical precision.
- There is little evidence or clues left behind at the scene.
- They tend to be of above-average intelligence, in a skilled, professional occupation and are socially and sexually competent.
- They are usually married and may even have children.
Outline the characteristics of disorganised offenders
Richard Ramirez – Disorganised offender
- Shows little evidence of planning suggesting the offence may have been a spontaneous, spur of the moment act.
- The crime scene tends to reflect the impulsive nature of the attack – the body is usually still at the scene and there appears to have been very little control on the part of the offender.
- They tend to have a lower than average IQ, be in unskilled work or unemployed, and often have a history of sexual dysfunction and failed relationships.
- They tend to live alone and often relatively close to where the offence took place.
Outline The construction of an FBI profile
There are four main stages in the construction of an FBI profile:
Data assimilation - the profiler reviews the evidence (crime scene photographs, pathology reports, witness reports, etc)
Crime scene classification - as either organised or disorganised
Crime reconstruction - hypothesis in terms of sequences of events, behaviour of the victim, etc
Profile generation - hypothesis related to the likely offender, e,g, of demographic background, physical characteristics, behaviour, etc
Define the bottom up approach
Unlike the American Top-down approach, this model builds a picture of the potential criminal from facts and figures collected from previous crimes of the same type. This removes the intuition element of profiling. Thus it is a data driven approach to profiling
Outline Investigative Psychology in the offender profiling
Bottom-up profiling is much more grounded in psychological theory than the Top-down approach. We call this investigative psychology which is the term used to describe an approach fine tuned by David Canter in the UK.
There are some key assumptions of investigative psychology that underpin the crime, specifically what occurs between the victim and the offender:
* interpersonal coherence – that the way an offender behaves at the scene, including how they ‘interact’ with
the victim, may reflect their behaviour in more everyday situations. For example, an aggressive person is more likely to commit an aggressive crime.
* The significance of time and place these are similar to the time and location factors in the top-down approach where the positioning and timing of crimes gives clues as to where the perpetrator might live or work. However statistical techniques are used for geographic profiling.
* forensic awareness describes those individuals who have been the subject of police interrogation before; their behaviour may denote how mindful they are of ‘covering their tracks’
Outline the Smallest space analysis in offender profiling
With these assumptions in place, investigative psychologists can work on a profile using statistical
techniques. One such statistical technique is called
‘smallest space analysis’ (or multi-dimensional scaling)
which is a computer program that identifies correlations
across patterns of behaviour. Which can establish patterns of behaviour that are likely to occur or co-occur across crime scenes. This is in order to develop a
statistical ‘database’ which then acts as 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. This may also determine whether a series of offences are linked in that they are likely to have been committed by the same person
Outline the Geographical profiling in Offender profiling
Bottom up profiling also uses geographic profiling. Canter proposed that people do not just reveal themselves through the crimes they commit but also
through the locations they choose. The assumption is that serial offenders will restrict their ‘work’ to geographical areas they are familiar with, and so understanding the spatial pattern of their behaviour provides investigators with a ‘centre of gravity’ which is likely to include the offender’s base (often in the middle of the spatial pattern)
Outline the circle theory in Geographical profiling
It may also help investigators make educated guesses about where the offender is likely to strike next -called the ‘jeopardy surface’. Canter’s circle theory (Canter and Larkin, 1993) proposed the two models of offender behaviour:
* The marauder – The offenders home is within the geographical area in which crimes are committed.
* The commuter – The offender travels to another geographical area (often familiar to them) and commits crime within a define space around which a circle can be drawn.
Crucially, though, the pattern of offending is likely to form a circle around their usual residence, and this becomes more apparent the more offences there are. Such spatial decision making can offer the investigative team important insight into the nature of the offence, i.e. whether it was planned or opportunistic, as well as revealing other important factors about the offender, such as their ‘mental maps’(), mode of transport, employment status, approximate age, etc. () Mental maps are people’s internal representations of the external world and are unique to each individual
Evaluate the Top down offender profiling
An issue with the top-down approach to offender profiling is the unscientific way it was developed. It developed using interviews with 36, male, sexually motivated murderers in the US. It could be argued that the sample is too small and unrepresentative to base the
typology system on. Also, this classification system was constructed based on self-report data from convicted killers who may lie or exaggerate in interviews. This questions the validity of the data gathered on which the top down is based on and so questions the whole approach.
An issue with this method of profiling is the limited range of crimes that the profile can be applied to. As the sample it is based on were males convicted of violent, sexual crimes it can only really be used in violent crimes like murder. More common offences such as burglary
then do not lend themselves to top-down profiling also the resulting crime reveals very little about the offender.
This restricts the applicability of the top-down approach and means it is a limited approach for identifying all criminals and crimes.
An issue with top-down profiling is that the notion of having an organised OR a disorganised criminal is just too simplistic. Canter (2004) when analysing 100 serial killers in the US who had been classified as organised or disorganised found there was no distinction between the two and concluded that all such crimes will have an organised element to them. Canter suggests that it would be better to study the individual personality differences
between offenders than the organised and disorganised elements to their crimes. This reduces support for top-down profiling as the distinction of just two types is too
restrictive. This ultimately affects the accuracy of the top-down profiling system
Evaluate the Bottom up approach in offender profiling
A strength of the bottom up, approach to offender profiling is the scientific way that a profile is developed.
Profiles are data driven, using psychological theory and statistical analysis such as geographical profiling. Research supports this scientific approach as Canter and Goodwin (1997) found for example that 85% of offenders did indeed live within the circle encompassing their offenses. This means that the bottom up approach is a
more objective way of developing a profile, not having to rely on intuition rather than science like the top-down approach
The strength of the Bottom-up approach is that it
can be applied to a wide range of offences. Techniques such as smallest space analysis and the principle of spatial consistency can be used in the investigation of crimes such as burglary and theft as well as more serious offences such as murder. However, Koscis (1997) found that only 50% of burglars lived in the circle defined by their offenses. This suggests that although the bottom-up does apply to a wide variety of offenses which is a
definite strength, some crimes such as theft may be harder to profile successfully
Psychological profiles based on this approach have assisted the police in catching offenders on numerous high-profile cases such as John Duffy. Copson (1995) carried out a survey of detectives who had worked with offender profiling and found that the advice given in the profile was useful in 83% of the cases where it had been used. HOWEVER it had only helped to catch the
offender in 3% of the cases. One of the problems seems to come from a lack of consistency in the British approach. There are a number of individuals in the UK providing psychological profiles for the police with different backgrounds in psychology and psychiatry, each
using their own approach with success also depending on accurate and detailed records on crime databases.
Outline the historical approach (atavistic form)
Atavistic form was an early biological explanation for criminal behaviour which was proposed by Cesare Lombroso in 1870’s.
Lombroso suggested that criminals were ‘genetic throwbacks’ – a primitive sub-species who were biologically different from non-criminals. Offenders were seen by Lombroso as lacking evolutionary development, their savage and untamed nature meant that they would find it impossible to adjust to the demands of a civilised society and would inevitably turn to crime. Therefore, he argued that criminals were not to blame for their activities as their behaviour was determined by their
physiology.
His work centred on the idea that criminals had distinguishing physical features which originated
from a more primitive stage of development. These biologically determined ‘atavistic’ characteristics, mainly features of the face and head made criminals physically different to noncriminals.
Outline the physical characteristics in the atavistic form
The atavistic form included a narrow sloping brow, a strong prominent jaw, high cheekbones and facial asymmetry. Other physical features included dark
skin and the existence of extra toes, nipples or fingers.
Lombroso went on to categorise particular types of criminal in terms of their physical and facial
characteristics:
* Murderers were describes as having bloodshot eyes, curly hair and long ears
* Sexual deviants - glinting eyes, swollen fleshy lips and projecting ears
* Fraudsters – thin lips and ‘reedy’
Evaluation of the atavistic form
Lombroso examined the facial and cranial features of Italian convicts, both living (3839) and dead (383) and concluded that 40% of criminal acts could be accounted for by atavistic characteristics. However, Lombroso did not compare his criminal sample with a non-criminal control group, if he had the significant differences in atavistic form that Lombroso reported may have
disappeared. This significantly reduces the extent to which Lombroso’s research supports his atavistic form theory
One issue with the atavistic theory is that it is socially sensitive. This is because there are racial undertones within Lombroso’s work. Many of the atavistic features that are linked to offenders and this “sub-species” (e.g. dark skin, curly hair) are most likely found among people
of African descent. This theory then can have negative implications on this group of people and could lead to discrimination and inaccurate and negative stereotypes that certain racial groups are more likely to be criminals. This is one of the reasons why this theory is not used within criminology today.
One issue with Lombroso’s atavistic theory is that it is biologically determinist. He believed that criminals were biologically different to non-criminals and so criminality was innate and inherited. This is an issue because it removes blame and responsibility for criminal behaviour which isn’t compatible with the criminal justice system in the UK. A bigger issue though is the ethical implications of this determinism, i.e its eugenic implications. Believing
in this theory introduces the possibility of irradicating criminality by only allowing particular people without atavistic features to produce children.
Outline the genetic explanations for offender behaviour
Genetic explanations of offending suggest that offenders inherit a gene or a combination of genes that predisposes them to commit crime and so the closer a person is genetically to an offender the more at risk they are of becoming an offender themselves. Genetic explanations for offending however, focus on ‘criminal’ genes such as the MAOA gene.
MAOA Gene =The candidate gene MAOA has been linked to offending. A fault/variation on this gene leads to lower levels of monoamine oxidase being released, an enzyme that breaks downs serotonin and so this means that there are higher levels of serotonin than usual. This has been linked to increased levels of aggression and violence as individuals with these increased levels of serotonin are hypersensitive, so are affected by more negative experiences and thus react more aggressively leading to an increased risk of offending. This variation is also known as the warrior gene
Outline the neural explanations of offending behaviour
Neural explanations suggest there may be neural differences in the brains of criminals and non-criminals. Much of the evidence in this area has investigated individuals diagnosed with anti-social personality disorder (formerly known as psychopathy) – APD. APD is associated with reduced emotional responses and a lack of empathy. It is a condition that characterises many convicted criminals.
Prefrontal cortex: Brain imaging studies have found that individuals with antisocial personalities have less brain matter in the prefrontal cortex than control groups and had lower activation or activity of the pre-frontal cortex. The role of the prefrontal cortex includes regulation of emotional behaviour, and so lower activation or a dysfunction can lead to impulsiveness and lack of self-control which makes a person at increased risk of offending.
Amygdala: The amygdala, found in the limbic system, is a part of the brain involved in fear, aggression and social interactions and has been implicated in offending. The
activation of the amygdala has been linked to offending with lower levels of serotonin thought to inhibit the amygdala activity. This lower activation of the amygdala means a person may recognize a person is afraid but may not feel concern or empathy or really care that they are. These lower levels of serotonin are also linked to aggression so the combination of lack of empathy and
aggression again increases the risk of offending.
Evaluate the genetic explanations for offending behaviour
A strength is support for this diathesis stress model of offending. A study of 13.000 Danish adoptees was conducted by Mednick et al. (1984). When neither the biological or adoptive parents had convictions, the percentage of adoptees that did was 13.5% (which is quite high). This figure rose to 20% when either of the biological parents had convictions, and 24.5% when both adoptive and biological or adoptive parents had convictions, their percentage of adoptees that did was 13.5% (which is quite high). This figure rose to 20% when either of the biological parents had convictions and 24.5% when both adoptive and biological parents had convictions. This shows that genetic inheritance plays and important role in offending but environmental influence is clearly also important, providing support for the diathesis-stress model of crime
A limitation with using twin studies as genetic evidence is the assumption of equal environments. It is assumed by researchers studying twins that environmental factors are held constant because twins are brought up together and therefore must experience similar environments. However, this ‘shared environment assumption’ may apply much more to MZ twins than DZ twins because MZ twins look identical and people Especially parents) tend to treat them more similarly which affects their behaviour. Therefore higher concordance rates for MZs in twin slides may simply be because they are treated much more similarly than DZ twins
It is presumed that adoption studies, such as Mednick et al., are a good way of separating nature and nurture. This is because adopted children are obviously not raised by their biological parents so this rules out any environmental influence the biological parents may have had. However, if the biological parent has criminal convictions, this method offers a good way of assessing whether a tendency towards criminal behaviour can be inherited. If crime has a genetic component, then an adopted child should still experience the influence of the biological parent despite not living with them. However, this is complicated by the fact that many adoptions take place when children are older, so they spend several years with their biological parents. This means that in the early and arguably most influential years, late-adopted children are still very much environmentally influenced by their biological parents. In addition, many adoptees are encouraged to maintain contact with the biological family so their environmental influence may still be felt. This suggests that adoption studies may offer some insight into genetic influences but should be treated with caution. This is because other issues may mean that socialisation processes between the adopted child and the biological parent(s) may still be taking place.
Evaluate the neural explanations of offending behaviour
One strength of the neural explanation is support for the link between crime and the frontal lobe. Kandel and Freed (1989) reviewed evidence of frontal lobe damage ( including the prefrontal cortex) and antisocial behaviour. People with such damage tended to show impulsive behaviour, emotional instability and an inability to learn from their mistakes. The frontal lobe is associated with planning behaviour. This supports the idea that brain damage may be causal factor in offending behaviour
One criticism of neural explanations of offending behaviour is that they can be considered reductionist. For example, where researchers look at the way a neurotransmitter or brain region might contribute to offending behaviour, they are overlooking other important factors, such as how the environment might have an impact on these areas as well. That being said, such researchers will argue that to be reductionist allows a more straightforward investigation to be conducted as it would be nearly impossible to disentangle all of the possible explanations and their interactions and investigate them scientifically.This is important to consider as while reducing complex behaviour to its simplest form does require researchers to overlook key factors, it is also essential for good scientific practice
The biological approach to crime suggests that criminal behaviour is determined by genetic/neural factors which cannot be controlled by the person. A person does not ‘choose’ their genetic make-up or the structural abnormalities in their brain that they may have been born with. If these influences make a person more likely to commit crime than other people in the general population, this suggests that crime is not entirely an act of free will. This means the person can’t help how they behave and should not be held responsible for a crime. However, our justice system is based on the notion that we all have responsibility for our actions. Trial by jury is based on the principle of establishing guilt – whether an individual has consciously chosen, under their own free will, to commit the offence they are accused of. Only in extreme circumstances, such as a diagnosis of mental disorder, is an individual judged to lack responsibility. The identification of possible biological precursors to crime complicates this principle. This suggests we should maybe ‘excuse’ some people but, ultimately, this is not possible because then no one would have responsibility
Briefly outline Eysenck’s theory of the criminal personality
According to Eysenck all personality types - including the criminal personality - are innate; have a biological basis. Offenders, he claimed, inherit a type of nervous system that predisposes them to offending. The personality types he believed were linked to offending were neurotic-extravert (with psychoticism added later)