Forensics Flashcards
Eyesneck’s theory - AO1
Three dimensions; claims 67% variance of traits = genes
- extraversion - introversion - extraverts characterised as outgoing and having a positive emotions but get bored easily - determined by levels of arousal in someones nervous system - seek external stimulation to increase cortisol arousal
- psychoticism - stable - the tendency to experience negative emotional states - linked to levels of testosterone - men therefore more likely to be found here
- neuroticism - normality - psychotics are egocentric, aggressive, impulsive, impersonal, lacking in empathy and not concerned about welfare of others - determined by level of stability in SNS - person with high neuroticism = gets easily upset
Eyesneck’s theory - AO3
- Support for the way that personalities have a biological basis - twin studies - researcher found a +.52 correlation for MZ twins for neuroticism and 0.24 for DZ twins - extraversion - MZ (.51) DZ (.12) - issue because MZ are meant to have a 100% gene sharer so may also be due to environmental factors
- Personality may not be consistent - people may be consistent in some situations and not others - some may be relaxed at home but neurotic at work - study done - 63 people observed in a variety of situations - found almost no correlation between behaviours - therefore notion of criminal personality flawed as we don’t have one personality
- Real world application - offering treatment to reduce their criminal tendencies - 3 traits are good at recognising delinquency but not at predicting whose likely to become an offender - may be useful in how to prevent criminal behaviour - eg - modifying the socialisation experiences of children who have potential to become an offender - this suggests that the theory could have applications in preventing or treating offending behaviour
Psychological explanations of offending behaviour - Cognitive - AO1
- Cognitive distortions - irrational or inaccurate thinking which can allow an offender to rationalise their behaviour
- Hostile attribution bias - where you negatively infer what people are actually thinking. This can then lead to aggressive behaviour
- Minimisation - someone under exaggerates their actions to justify it in their own head (sex offenders)
Moral reasoning: Kohlberg - 3 stages of biological maturity
- Pre conventional level - children under 10 - judge actions through consequences - criminals likely to be at this level
- Conventional level - adults believe that conformity to social rules is desirable, as it maintains social order and positive relationships - offender might accept breaking the law to protect a member of their family or protecting other people
- Post conventional level - 10% of adults reach this stage, defining morality by abstract moral principles rather than compliance to norms
Psychological explanations of offending behaviour - Cognitive - AO3
- Research support for hostile attribution bias - studies of violent offenders in prison - showed emotionally ambiguous faces to 55 violent offenders in prisoners and compared their responses to matched control normal ppts - angry, happy or fearful emotions in varying levels of intensity - offenders more likely to interpret any picture that had some expression of anger or an expression of aggression - supports idea of misinterpretation of facial expressions (non verbal)
- Research into levels of moral reasoning - study done - 128 male juvenile offenders found that 38% did not consider the consequences of their actions and 36% were confident they would not be caught (pre conventional) - another study - 330 male adolescent offenders in Taiwan. Those offenders who showed more advanced reasoning were less likely to be involved in crimes - supports relationship between moral reasoning and offending behaviour
- Research support for minimalisation - sex offenders - researchers found sex offenders accounts of their crime often downplayed their behaviour - For example the offenders suggested that the victims behaviour contributed in some way to the crime. Some also denied the crime - this supports the view that offenders do use minimilisation but it is a fairly normal denial mechanism for everyone to protect themselves and blame things on external sources
Psychological explanations of offending behaviour - Differential association - AO1
- A child learns attitudes towards crime through intimate groups like peers/family through social associations
9 key principles: - Criminal behaviour is learned rather than inherited
- Learned through association with others
- Association with intimate groups
- What is learned is techniques and attitudes
- Learning is directional - either for or against crime
- Number of favourable attitudes outweigh unfavourable ones
- The learning experiences vary in frequency and intensity
- Criminal behaviour is learned through the same processes as any other behaviour
- General ‘need’ is not a sufficient explanation for crime because not everyone with those needs turn to crime
Psychological explanations of offending behaviour - Differential association - AO3
- Supporting evidence - from family studies done - where there is a father with a criminal conviction 40% of the sons committed a crime by the age of 18 compared to 13% of sons of non criminal fathers - study - survey of 2500 male and female adolescents in the US Akers found the most important influence on drinking and drug behaviour was from peers; differential association, differential reinforcement and imitation combined to account for 68% of the variance in marujana use and 55% of alcohol use - this suggests it can explain the social influences but cannot separate genes from environment completely
- Explanation is reductionist as it does not take into account any biological factors - diathesis stress model may offer a better account by combining social factors with vulnerability factors - vulnerability factors may be innate genetic ones or it might be that early experiences act as a vulnerability - Therefore the social approach on its own may be insuffiecient as an explanation to offending behaviour
- Social learning can not account for all kinds of crime and it probably influences ‘smaller’ crimes than bigger ones - this kind of ‘smaller’ crime accounts for a bigger percentage of the crimes committed than violent and impuslsive offences. For example, in England and Wales in 2014 there were about 500 homicides but more than 400,000 burgularies - 40% of offences are carried out by people under the age of 21 which is better explained by a desire for risk taking - differential association only gives a partial explanation of offending behaviour
Top down approach of offender profiling - 6 stages - AO1
- Profiling inputs - data collected at this stage includes a description of the crime scene, background info about the victim and details of the crime - INCLUDES EVERYTHING
- Decision process models - profiler starts to make decisions about the data and organises it into meaningful patterns - murder type, location, time
- Crime assessment - offender classified as organised (planned, try to hide body, high in intellegence) or disorganised (unplanned, random, no attempt to hide body, sexually incompetent)
- Criminal profile - profile is now constructed of the offender which includes hypotheses about their likely background habits and beliefs of the offender
- Crime assessment - written report is given to the investigation agency and persons matching the profile are evaluated
- Apprehension - If a suspect is apprehended the entire profile generating process is reviewed to check that at each stage the conclusions were made legitimate
Top down approach of offender profiling - AO3
- Police who have used the top-down approach have found it useful - Copson questioned 184 US police officers - 82% said the technique was operationally useful and over 90% said they would use it again - approach offers investigators a different perspective opens up new avenues for investigation and may prevent a wronful conviction - supports usefulness of approach
- However the method is based on flawed data - data came from interviews with 36 of the most dangerous and sexually motivated murderers including Ted Bundy - its dubious as such individuals are not likely to be the best source of reliable information - these killers may have a different approach to ‘typical killers’ the classification of crimes and criminals may not be generalisable
- Furthermore top-down approaches may be harmful as profiling could mislead investigators - researcher argue that profilers actually do little more than pyschics who it could be argued often have a wealth of experience in reading behaviour - beliveability of profiles may be explained in terms of the Barum effect - ambigious descriptions can be made to fit any situation as in the case of horoscopes which explains why profiles often appear to be ‘right’ - suggests that the police and courts should take care not to be convinced by profiles and it also raises the question about whether information about the techniques used by police should be generally available
Bottom up approach - Three main features - AO1
- Interpersonal coherence - people are consistent in their behaviour and therefore there will be links with elements of the crime and how people behave in everyday life - people’s behaviour changes over time and therefore looking at the differences in crime over a four year period might offer further clues
- Forensic awareness - Certain behaviours may reveal an awareness of a particular police techniques and past experience; for example; Davies found that rapists who conceal fingerprints often had a previous conviction for burglary
- Smallest space analysis - Data about many crime scenes and offender characteristics are correlated so that the most common connections can be identified;
Instrumental opportunistic - ‘instrumental’ refers to to using murder to obtain something or accomplish a ‘goal’ and opportunistic means they took the easiest opportunities
Instrumental cognitive - a particular concern about being detected and therefore more planned
Expressive impulsive - uncontrolled, in the heat of the moment and may feel provoked by the victim
Bottom up approach - Geographical profiling - AO1
- analyses the locations of a connected series of crimes and considers where the crimes were commited, the spatial relationships between different crime scenes and how they might relate to a person’s place of residence
- circle theory - If crimes are similar in nature and plotted on a map it may be possible to join the plot points in a circle and their base would be in the middle of the circle
- marauder - home base is within the geographical area in which crimes are committed
- commuter - people who travel in and out of for work etc.
- Criminal geographic targeting - computerised system - produces a three dimensional map displaying spatial data related to time distance and movement to and from crime scenes
Bottom up approach - AO3
- Evidence that goes against the circle theory - researchers showed research support for their model by distinguishing between marauders and commuters in a study of 45 sexual assaults. However, in the study 91%of the offenders were identified as marauders and this classification therefore doesn’t seem particularly useful - if a persons home base is not actually at the centre of the circle police may look in the wrong place - circle theory can therefore be useful for narrowing down searches but could lead police to look in the wrong places (not 100% useful)
- Bottom up approaches may not be as scientific as they claim to be - use objective statistical techniques and computer analysis which makes them appear to be more scientific than top down approach - One issue is that the data used to drive such systems is related only to offenders who have been caught and therefore this tells us little about patterns of behaviour related to unsolved crimes - means that the bottom up approaches may have the potential to be objective and systematic but in practise they are inevitably biased
- Critics question the usefulness of investigative psychology in actually solving crimes - example from Copson suggests the approach is useful - BUT - only 3% said the advice had helped identify the actual offender and in his study in one year the max number of crimes where profiling was useful was only 75 cases - suggests that it only gives a slight benefit in catching offenders
Biological explanations for offending behaviour - Historical approach - Atavistic form - AO1
- Lombroso - proposed that offenders possess similar physical characteristics to lower primates and this could explain their criminality
- He said - there is an asymmetry of the face excessive dimensions of the jaw and cheekbones eye defects and peculiarities
- Born criminals: the atvastic type; throwbacks identifiable from their physcial characteristics
- Insane criminals: suffering from mental illness
- Criminaloids: a large general class of offenders whose mental characteristics predisposed them to criminal behaviour under the right circumstances
- He gathered empirical evidence from post-mortem examinations of criminals and studying the faces of living criminals
- Studied skulls and other physiological aspects
- Studied 50,000 bodies altogether
- In one particular study of 383 convicted Italian criminals he found that 21% had just one atvistic trait and 43% had at least 5
Biological explanations for offending behaviour - Historical approach - Somatotypes - AO1
- 4 criminal types linked to body-shape or somatotype
- Leptosome or asthenic - tall and thin; petty thieves
- Athletic - tall and muscular; crimes of violence
- Pyknic - short and fat; commit crimes of deception and sometimes violence
- Dysplastic or mixed - more than one type (mix) ; crimes against morality (prostitution)
Biological explanations for offending behaviour - Historical approach - AO3
- Lombroso = gender biased as it is based on the notion that women are less evolved than men - believed that women were naturally jealous and insensitive to pain but also passive low in intelligence and maternally focused - meant they were less likely to be involved in crime - women who did become criminals, according to Lambroso had masculine characteristics that turned them into ‘monsters’ - suggests that his explanations are based on typical nineteenth century views about women rather than empirical evidence
- Some evidence supporting a link between body type and criminality - researchers found that 60% of delinquents were mesomorphs roughly equivalent to the athletic type - another researcher studied young adults - study of 200 young adults he concluded that there were differences between delinquents and non delinquents in terms of body type - the delinquents tended to be mesomorphs - supports notion of innate criminal types identified by their physical features but a correlation with a body type does not imply a causal relationship
- Lack of adequate controls - studied prisoners he didn’t pay the same kind of attention to non prisoners. Had he done so its likely that he would have found as many non prisoners with the same characterisitics as he found in prisoners - researcher compared 3,00 convicts with a group of non convicts finding no differences except for the fact that convicts were slightly smaller - lack of controls in his research therefore undermines his conclusions
Biological explanations for offending behaviour - Genetics - AO1
- Genes may predispose individuals to criminal behaviour
- A faulty MAOA Gene was found by Brunner in
28 Violent males in a Dutch family - WARRIOR gene - He analysed the DNA of these men and found they shared a particular gene that lead to abnormally low levels of MAOA
- Another researcher estimated that 5-10% of violent crime in Finland is caused by abnormal CDH13 and MAOA genes
- Environmental factors ‘switch’ genes on or off. This is an Epigenetic Effect, changing the phenotype but not the genotype
- Caspi used data from following around 1,000 people from 1970’s - assessed anti social behaviour at age 26 and found that 12% of men with low MAOA genes had experienced maltreatment when they were babies but were responsible for 44% of violent crimes