3 - Forensic Psychology Flashcards
What is a crime?
An act that violates the law and results in punishment by the state. It is behaviour that has been identified as wrong by the law.
What is offender profiling?
Police build a picture of who they are looking for to help them make an arrest. It is not easy, and focuses more on narrowing down pre-existing suspects.
List some possible details that could be provided in an offender profile
Offender’s personality, age, race, type of employment, religion, marital status, level of education.
Explain the top down approach
It was based on 36 interviews with sexually motivated killers. It begins with a general classification of the crime scene into organised or disorganised. Profilers will match what is known about the crime to a pre-existing template. This classification informs subsequent police investigation.
What happens after classification in the top-down approach.
Once profilers have matched the crime to the pre-existing template, they can now construct a profile.
This includes a hypothesis about the offender’s background; habits, beliefs etc.
This is used to work out a strategy of investigation.
Profilers also consider how the offender is likely to react if they are being investigated.
List characteristics of an organised criminal
Quiet environments, planned crime/escape, pre-meditated attack, experienced, stalking, specific victim, body transported from scene, weapon is hidden, high intelligence, socially and sexually competent, have a car, follow their crimes in the media, multiple crimes/experienced.
List characteristics of a disorganised criminal
Any location, impulsive/spontaneous, inexperienced, one-off, no stalking, more evidence, unplanned crime, random victim, offender unlikely to engage with victim, necrophilia, weapon and clues may be at the scene.
Evaluate the top-down approach to offender profiling
+ good application - eg: Arthur Shawcross. This approach helps label, describe and catch criminals. It’s useful and effective.
- only applies to specific crimes: rape, arson, murder, dissections, torture etc. More common offences (burglary, theft) don’t create crime scene.
- based on outdated models of personality - typology classification system - based on the assumption that offenders have patterns of behaviour and motivations that remain consistent across situations and contexts. Several critics (Alison et al. ‘02) say it’s naïve and informed by old fashioned models - they see behaviour as being driven by stable dispositional traits instead of external factors that may be constantly changing. The approach is based on “static” models. Poor validating when identifying criminals/predicting next moves.
- classification is too simplistic - what if someone shows both organised and disorganised traits (give eg:). Other typological models: Holmes (‘89) says there’s 4 types of serial killer: visionary, mission, hedonistic, power/control. Keppel and Walter (‘99) said there are different motivations rather than specific types.
What did David Canter do?
What was the aim of his study?
When was this?
Provided evidence that the classification had little basis in reality.
Aim: to test the reliability of the top-down typology by applying them to 100 cases.
2004
What was the procedure of Canter’s study?
A content analysis or 100 cases of serial killers from the USA.
The cases came from published accounts of serial killers and were cross-checked with court reports and officers where possible.
What were the findings of Canter’s study?
Twice as many disorganised crimes as organised crimes were identified, suggesting that disorganised offenders are more common or easier to identify.
2 behaviours in the organised typology occurred a level significantly above chance.
In 70% of cases, the body was concealed.
In 75% of cases, sexual activity had occurred.
Further analysis failed to reveal any significant differences between organised and disorganised variables.
What were the conclusions of Canter’s study?
He concluded that instead of their being a distinction between the 2 types of serial murderer, all of the crimes had to have an organised element to them.
The distinction between serial killers may be a function of the different ways in which they exhibit disorganised aspects in their activities.
It would be better to look at personality differences between offenders
Describe the bottom-up approach
Who made it?
Canter. It looks for consistencies in the offender’s behaviour during the crime. These can be inferred from the crime scene, or from surviving victims’ accounts. No initial assumption is made about the offender until a statistical analysis using correlations techniques has been carried out on the details of the cases.
This approach relies heavily on computer databases being accurate.
This approach can be considered more objective and reliable.
List the 7 possible issues of offender profiling using the bottom-up approach
Human error Anomalous data Eye witness testimonies Leading questions Data being lost Not all crimes are followed up Not all crimes are reported
Explain investigative psychology
This inputs data to create a statistical database which then acts as a baseline for comparison. Information and characteristics can be added from new crime scenes to show personality traits from previous similar crimes. They use stats to analyse large volumes of data to find correlations. This also helps to determine if offences are linked.
Define interpersonal coherence
The way an offender behaves at the scene, including how they “interact” with the victim. An offender’s crime scene behaviour may reflect their everyday behaviours.
Explain geographic profiling
Based on areas where crimes take place - they plot them and commonly there is a circle theory - where there is eventually a circle around the criminals location as their crimes create a circle and surround them.
What are the 2 models of offender behaviour in geographic profiling?
Define them
The marauder - a criminal that lives near to where the crime takes place
The commuter - a criminal that lives far away from their crimes (they commute)
What are the 2 parts of the bottom-up approach to offender profiling?
Investigative profiling
Geographic profiling
Evaluate the bottom-up approach to offender profiling
+ evidence for investigative psychology - Canter and Heritage (‘90) conducted a content analysis of 66 sex assault cases. They did this using smallest space analysis. This is a program that identifies correlations across patterns of behaviour. Some characteristics are described as common. These will occur in different patterns in different people. This leads to knowing how their behaviour may change throughout different crimes. This supports the usefulness (validity) of I.P - it shows how statistical techniques can be applied.
+ evidence for geographic profiling - Lundrigan and Canter (‘01) collected info on 120 murders with serial killers in USA. Smallest space analysis revealed spatial consistency and a “centre of gravity.” This is more noticeable for marauders. This supports Canter’s claim that spatial information is an important for determining location of offenders.
- human error - incorrect information can be inputted. EWT can be affected, missing evidence or incorrect input of data - validity.
+ scientific bases for bottom-up, more evidence based than top-down; more statistics - reliability.
- Gary Coppson studied 48 police forces and found that 83% were useful but only 3% were accurate - validity.
+ wider application - B-U can be applied to a wider range of offences compared to T-D. They can be used for burglary and theft as well as murder and rape.
Define atavism
The tendency to return to our ancestral types
Using Darwin’s theories, Lombroso thought criminals were a
Separate species of mankind
When did Lombroso develop his explanation?
1876
What are the 4 distinguishing characteristics that Lombroso professed that criminal could be identified by?
Asymmetrical face
Unusually large or small ears
A low receding forehead
Prominent eyebrows, cheekbones or jawbones
List and define the 3 types of criminals Lombroso identified
Born criminals - the atavistic type
Insane criminals - suffering from mental illness
Criminaloids - mental characteristics predisposed them to criminal behaviour under the right circumstances
What are the 4 somatotypes?
Define them
Who identified them?
When did they do this?
Kretschmer - 1921
Leptosome/asthenic - tall and thin; petty thieves
Athletic - tall and muscular; violent crimes
Pyknic - short and far; commit crimes of deception, sometimes violence
Dysplastic/mixed - more than 1 type; crimes against morality (eg: prostitution, drugs, illegal gambling etc.)
Evaluate the historical explanation
- Lombroso believed women were less evolved than men. He believed they were less likely to commit crimes because they were passive, low in intelligence and had maternal instincts. However, he never studied women - generalisability, socially sensitive research.
- Goring (1913) found no differences between convicts and non-convicts (3,000 of each). There was no distinct group of unusual facial and cranial characteristics. This decreases reliability.
+ Lombroso has been praised for bringing science to the study of crime. His types of criminal have been heralded as the beginning of criminal profiling - reliability. - Delisi (2012) drew attention to the distinct racial undertones. Most features were African. Also, his description of criminals being uncivilised, primitive and savage supported eugenic philosophies of the time - ethics
What is a gene?
A unit of hereditary which is transferred from a parent to offspring and is held to determine some characteristic of the offspring.
Who conducted the first study into twins and criminal behaviour?
When was this?
Explain the study
Lange - 1930
13 MZ twins and 17 DZ twins where within each pair, one had served time. 10 MZ twins had their co-twin in prison, only 2 DZ twins.
Explain the hormones involved in criminal behaviour
Monoamine oxidase A has been associated with aggression.
MAOA regulates the metabolism of serotonin in the brain. Low levels of serotonin are linked with impulsive and aggressive behaviour.
CHD13 is linked to ADD and substance abuse.
What does MAOA stand for?
Monoamine oxidase A
Explain Tiihonen’s study
When did this take place?
2015
900 offenders found low MAOA activity and also low activity of the CDH13 gene.
They estimated around 5-10% of all violent crime in Finland is due to abnormalities in one of these 2 genes.
Explain Mednick’s study and the results
When did this take place?
1984
He conducted an adoption study on 13,000 Danish adoptees. He compared the likelihood of being criminal.
No criminal record for biological or adoptive families - 13.5%
Biological parents had criminal record - 20%
Biological and adoptive parents had criminal record - 24.5%
Evaluate the genetic explanation for crime
+ supports diathesis stress model. Mednick’s study shows that environmental influence cannot be disregarded - reliability
- problems with adoption studies - many kids are either adopted late or keep in touch with their biological parents. This makes it hard to assess environmental impacts of biological parents - int validity.
Also, Mednick’s study - the crimes by the kids weren’t violent - so his study is not applicable to serious forms of crime - application.