Forensic Psychology Flashcards
What is offender profiling?
A behavioural and analytical tool that is intended to help investigators accurately predict and profile the characteristics of unknown offenders
What is the top-down approach?
Profilers start with a pre-established typology and work down to lower levels in order to assign offenders to one of the two categories based on witness accounts and evidence from the crime scene.
Where did the top-down approach originate from?
In the United States as a result of work carried out by the FBI in the 1970s.
How was the top-down approach established?
The FBI drew upon data gathered from in-depth interviews with 36 sexually motivated murderers including Ted Bundy and Charles Manson;
They concluded that the data could be categorised into organised/disorganised crimes with each category having certain characteristics.
How can the top-down approach be used in future crimes?
If the data from a crime scene matched some of the characteristics of one category we could then predict other characteristics, which can be used to find the offender.
Define organised offender.
An offender who shows evidence of planning, targets a specific victim and tends to be socially and sexually competent with higher-than-average intelligence.
Define disorganised offender.
An offender who shows little evidence of planning, leaves clues and tends to be socially and sexually incompetent with lower-than-average intelligence.
Describe the characteristics of an organised offender.
Show evidence of having planned the crime in advance;
The victim is deliberately targeted and this suggests the killer or rapist has a ‘type’ of victim they seek out;
Offender maintains a high degree of control during the crime and may operate with almost detached surgical precision;
There is little evidence or clues left behind at the scene.
Describe the characteristics of a disorganised offender.
Show little evidence of planning, suggesting that their offences may be spontaneous;
The crime scene tends to reflect the impulsive nature of the attack - the body usually remains at the crime scene and there appears to be very little control from the offender;
They tend to live alone and close proximity to the crime scene.
State the four main stages of constructing a FBI profile.
- Data assimilation - the profiler reviews the evidence.
- Crime scene classification - either organised or disorganised.
- Crime reconstruction - hypotheses in terms of sequence of events.
- Profile generation - hypotheses related to the likely offender e.g. demographic background.
Evaluate the top-down approach.
- Research support - Canter analysed data from 100 USA murders using smallest space analysis and the analysis matched the FBI’s typology for organised offenders. HOWEVER, Maurice argues that it is hard to classify killers as either organised or disorganised as they could have multiple contrasting characteristics.
- Wider application - Can be adapted to other crimes e.g. burglary. Tina Maketa reports the top down approach has led to an 85% rise in solved cases in three US states.
- Flawed evidence - Sample is too small and unrepresentative. Developed using interviews with 36 killers in the US in which 25 were serial killers and 11 were single or double murderers . 24 were organised and 12 were disorganised. Suggests top-down approach does not have sound, scientific basis.
- Personality - Top-down approach is based on the principle of behavioural consistency e.g. personality drives behaviour rather than by external factors. However situationist psychologists argue that behaviour is much more driven by the situation. This suggests behaviour patterns may tell us very little about how the individual behaves in every day life.
Define 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.
Describe the discipline of investigative psychology.
It is an attempt to apply statistical procedures, alongside psychological theory, to the analysis of crime scene evidence.
What is the aim of investigative psychology?
To establish patterns of behaviour that are likely to occur;
This is in order to develop a statistical database which then acts as a baseline for comparison.
Describe the central concept of investigative psychology?
Interpersonal coherence - the way an offender behaves at the scene may reflect their behaviour in more everyday situations.
What is another key variable of investigative psychology.
The significance of time and place as this may indicate where the offender is living.
What is forensic awareness?
Describes those individuals who have been subject to police interrogation before.
Describe geographical profiling.
Uses information about the location of linked crime scenes to make inferences about the offender’s likely home or operational base - which is known as crime mapping and is based on the principle of spatial consistency.
What assumption does geographical profiling have?
Serial offenders will restrict their ‘work’ to geographical areas they are familiar with, which is the basis of Canter’s circle theory.
What is Canter’s Circle Theory?
The pattern of offending forms a circle around the offenders home base.
Describe the two ways offenders are described as in Canter’s Circle Theory.
Marauder - who operated in close proximity to their home base.
The commuter - who travels a distance away from their usual residence.
Evaluate the bottom-up approach.
- EVIDENCE FOR INVESTIGATIVE PSYCHOLOGY - Canter and Heritage conducted an analysis of 66 sexual assault cases and found several behaviours as common in different samples of behaviour, which helps to establish whether to or more offences were committed by the same person. HOWEVER, case linkage depends on historical crimes that have been solved.
- EVIDENCE FOR GEOGRAPHICAL PRORFILING - Canter and Lundrigan collated information from 120 murder cases involving serial killers in the US and revealed spatial consistency in the bhaviour of the killers.
- GEOGRAPHICAL INFORMATION INSUFFICIENT - not sufficient on its own, as it is reliant on the quality of data that the police can provide which is not always accurate and 75% are not reported.
- MIXED RESULTS - regarded differently by police forces. Copson surveyed 48 police departments and found that the advice provided by the profiler was judged to be useful in 83% of cases. However in only 3% of cases did it lead to the accurate identification of the offender.
What did Lombroso suggest criminals were?
They were ‘genetic throwbacks’ - a primitive sub-species who were biologically different from non-criminals.
How were offender’s seen as by Lombroso?
Seen as lacking evolutionary development so their savage nature meant they would find it impossible to adjust to the demands of civilised society.
What did Lombroso believe about offending behaviour?
He believed offending behaviour was innate and therefore an offender should not be blamed for his actions.
What did Lombroso also argue about the biological characteristics of an offender?
They have biologically ‘atavistic’ characteristics such as a narrow, sloping brow, strong jaw, high cheekbones and facial asymmetry.
What did Lombroso go on to categorise?
He went on to categorise particular types of offenders in terms of physical and facial characteristics e.g. murderers have blood shot eyes and curly hair, whereas, fraudsters were thin and ‘reedy’.
What did Lombroso examine and what did he conclude from his examinations?
Examined the skulls of 383 dead convicts and 3839 living ones and concluded 40% of criminal acts are committed by people with atavistic characteristics.
Evaluate the atavistic form.
- LOMBROSO’S LEGACY - changed the study of crime - shifted crime research away from a moralistic discourse towards a more scientific approach - HOWEVER there are racial undertones - suggests some aspects were highly subjective.
- CONTRADICTORY EVIDENCE - Goring compared the physical characteristics of 3000 offenders to 3000 non-offenders - found there was no evidence that offenders are a distinct group with unusual facial and cranial characteristics - challenges the idea offenders can be physically distinguished - limits the applicability of Lombroso’s theory.
- POOR CONTROL - unlike Goring he did not compare his offender sample with a non-offender control group - could have controlled many confounding variables e.g. poverty - Lombroso’s research doesn’t not meet scientific standards - reduces validity.
- NATURE OR NURTURE? - questions whether criminals are born or made - AF suggests crime has a biological cause but having atavistic features does not mean this is the CAUSE of their offending - they may be influenced by other factors e.g. poverty.
What do genetic explanations suggest?
Suggests that would be offenders inherit a gene or combinations of genes that predispose them to commit crime.
Describe twin studies for the genetic explanations for offending behaviour.
- Christiansen studied over 3500 twin pairs in Denmark.
- He found concordance rates for offender behaviour for 35% identical twin males and 13% for non-identical twin males.
- Offender behaviour was checked against Danish police records.
- This data indicates that it is not just the behaviour that might be inherited but the underlying predisposing traits.
Describe adoption studies for the genetic explanations of offending behaviour.
Crowe found that adopted children whose biological mother had a criminal record had a 50% risk of having a criminal record by the age of 18, whereas adopted children whose biological mother didn’t have a criminal record only had a 5% risk.
Describe the study for candidate genes for the genetic explanations of offending behaviour.
Tiihonen et al conducted an analysis of almost 800 finnish offenders.
It was suggested that the two genes MAOA and CDH13 may be associated with violent crime.
The analysis found that about 5-10% of all severe violent crime in Finland is due to the MAOA and CDH13 genotypes.
What is the role of the MAOA gene?
Regulates serotonin in the brain and has been linked to aggressive behaviour.
What is the role of the CDH13 gene?
Has been linked to substance abuse and attention deficit hyperactivity disorder.
Describe the diathesis-stress model as a genetic explanation for offending behaviour.
A tendency towards offending behaviour may come about through combination of genetic predisposition and biological/psychological trigger.
For example, being raised in a dysfunctional environment or having criminal role models.
What are the three biological explanations for offending behaviour?
- Atavistic
- Genetic
- Neural
Which evidence is associated with genetic explanations of offending behaviour?
- Twin and adoption studies
- Candidate genes
- Diathesis-stress model