Forensic Pyschology Flashcards
L1: What is offender profiling and what is it based on
- Tool employed by the police to narrow down lists of likely suspects.
- based on idea that characteristics of offender can be deduced from details of the offence and crime scene.
L1: What is the top down approach
Templates of organised offender and disorganised offender are pre-existing in the mind of the profiler.
Evidence from crime scene then used to fit the offender into either of the two pre-existing categories, and determine the offender as one type or the
other.
L1: Organised offenders
These offenders show evidence of having plans the crime in advance. The victim is deliberately targeted, and more often reveal the fact that the killer or rapist has a preference for a certain type of victim .
They maintain high levels of control during the crime and leave little evidence of the scene of the crime
Are usually these offenders tend to be above-average intelligence in a skill, profession and a socially and sexually competent
L1: disorganised offenders
These offenders show little evidence of planning, suggesting the offence may have been spontaneous. The crime scene tends to reflect the impulsive nature of the attack with the body left at the scene and little control on part of the offender..
Do you find a tends to be of lower than average intelligence, in unskilled employment, and often a past of sexual dysfunction of failed relation. They usually live close to where the events took place.
L1: negative evaluation of top down approach (5-)
- Top-down profiling only applies to certain crimes (e.g. rape, arson, etc.). Common offences, such as burglary do not lend themselves to top-down profiling because the crime scene reveals very little about the offender.
- The organised or disorganised distinction was developed based on interviews with 36 serial killers in the USA. Critics have pointed out that this is too small and unrepresentative a sample upon which to base a typology system.
- Top-down profiling was developed based on interviews with 36 sexually motivates serial killers, including Ted Bundy and Charles Manson. Canter (2004) has argued that it is not valid to rely on self-report data from convicted serial killers when constructing a classification system.
- The organised or disorganised distinction is overly simplistic. Holmes (1989) suggests there are four types of serial killer; visionary serial killer (kill because God or the Devil is directing them to), mission serial killer (kill to eradicate a group of people they consider to be undesirable), hedonistic serial killer (kill for the thrill) and power serial killer (kill to have complete control over the victims).
- Canter et al. (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, however this was not the case for disorganised type which undermines the entire classification system.
L2: what is the bottom up approach
The aim of the approach is the generate a picture of the offender and their characteristics behaviour and social background. It’s achieved the systematic analysis of evidence left at the crime scene. The approach doesn’t begin with fix typologies, instead, the profile is data, driven and emerges as the profile, engages in rigourous scrutiny of the details of the offence.
L2: What are the aims of investigative psychology?
The aim is to establish behaviours that are likely to occur a certain crime scenes. It’s done to create a statistical database which is an act as a baseline for comparison, which can then be matched against certain offences in order to reveal the statistical probability of details about the offender.
L2: what is geographical profiling?
Geographical profiling is the study of spatial behaviour in relation to crime and offenders. It focuses on the location of the crime as a clue to where the offender lives, works and socialises. Relevant data includes the crime scene,
local crime statistics, local transport, and geographical spread of similar crimes.
L2: how does geographical profiling describe a criminals geographical behaviour?
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 crimes. As an offender becomes more confidence they will often travel further from their comfort zone.
L2: positive evaluation of 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.
L2: negative evaluation of bottom up approach
- There have been some significant failures when using bottom-up profiling. In 1992, 21 year old Rachel Nickell was stabbed 47 times and sexually assaulted in a frenzied attack on Wimbledon Common. In 2008, following examination of forensic evidence, Robert Napper was convicted of the murder. He had been ruled out early on in the initial investigation because he was several inches taller than the profile had claimed the offender would be.
- 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 in only 3% of cases did it lead to the accurate identification of the offender.
- 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 little more than common sense and guess work.
L3: What is the atavistic form?
It’s argued that the criminal subspecies could be identified by a set of particular physiological characteristics that were linked to particular types of crime. These were biologically determined atavistic (meaning reversion to something ancestral) characteristics, which indicate criminals are physically different from the rest of us.
L3: what were the cranial characteristics of criminals
The atavistic form into the narrow, sloping brow, strong, prominent jaw, high cheekbones and facial asymmetry other features include dark skin and extra toes or fingers.
Murderers is described as having bloodshot eyes, curly hair and long ears
Sexual deviance are described as having glancing eyes, swollen lips and projecting ears.
L3: positive evaluation of 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 (that of evolutionary influences and genetics).
L3: negative evaluation of atavistic form (4-)
- 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.
- Goring (1913) set out to establish if there were any physical or mental abnormalities among the criminal classes. After conducting a comparison of 3,000 criminals and 3,000 non-criminals he concluded that there was no evidence that offenders had particular facial and cranial characteristics. But he did suggest that criminals are more likely to have a below average intelligence.
- 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.
- 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.
L4: what do genetic explanations suggest for crime committing?
Suggest that potential offenders inherit a gene that predisposed and commit a crime.
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 of the
13 pairs of monozygotic twins had both spent time in prison, whereas only 2 of the 17 pairs of dizygotic twins had both spent time in prison.
L4: polygenic behaviour
Criminal behaviour could be poly genic, meaning that no one single gene is responsible for offending
L4: what are Candidate genes and their types
The many genes that are responsible for causing criminal behaviour are known as candidate genes. That being MAOA and CDH13 gene.
MAOA: controls dopamine and serotonin in the brain and is linked to aggressive behaviour
CDH13: this train has been linked to substance, abuse and attention deficit disorder
L4: what is the diathesis stress model?
The model holds that genetics influence criminal behaviour are moderated by the environment. A tendency towards criminal behaviour may come through a combination of genetic predisposition and biological or psychological triggers like being raised in a dysfunctional environment..
L4: neuro explanations for criminal offending
Evidence suggests there might be neural differences in the brains of criminals compared to non-criminals with most the evidence coming from individuals diagnosed with antisocial personality disorder
L4: what is APD associated with?
Associated with reduced emotional responses, lack of empathy which characterised as many convicted criminals. There is also several dozen brain imaging studies showing individuals with it have reduced activity in a pre-frontal cortex, which is the area of the brain to regulate emotional behaviour.
Raine et al. (2000), found an 11% reduction in the volume of grey matter in the prefrontal, cortex of people with it compare to a control group.
L4: negative evaluation of genetic and neural explanations
- Concordance rates in MZ twins are not high and leave plenty of room for nongenetic environmental factors. Concordance rates may be due to shared learning experiences rather than genetics.
2.Brain scanning studies (such as Raine et al., 2000) show pathology in brains of criminal psychopaths, but cannot conclude whether these abnormalities are genetic or signs of early abuse.
- The term ‘offending behaviour’ is too vague. Some specific forms of crime may be more biological than others e.g. physical aggression.
- The genetic and neural explanation of criminal behaiour is an example of biological reductionism. Criminality is complex and explanations that reduce offending behaviour to a 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. Twin studies never show 100% concordance rates in monozygotic twins, so genetics cannot be the only explanation for criminal behaviour.
- 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.