forensic psychology Flashcards
Explain the 6 stages of the top-down approach
What is the difference between organised and disorganised offenders?
- Profiling inputs - data is collected (crime scene is described, background info of offender is collected as well as details of the crime). All info should be included even if it appears trivial. Suspects should NOT be considered, as this may be bias the info collected
- Decision process models - Profiler starts to make the decisions about the data and organises it into meaningful patterns. The following issues are considered:
-Murder type - mass, spree, serial murders
-Time - did the crime take a long time/short time, night or day?
- Location - was the crime scene the same as the murder scene?
3.Crime assessment - Based on the data collected the crime is classified as organised or disorganised:
-Organised offender - planned, victim specifically targeted, weapon hidden, body moved, sexual acts usually acted on by offender, offender has high intelligence, social competence, usually has a family, car and job
-Disorganised offender - unplanned, victim is random, engage little with victim, sexual acts performed after death. Crime scene contains many clues
- Criminal profile - a profile of the criminal is constructed, includes a hypothesis, and likely background, habits + beliefs. Used to work out a strategy for the investigation to help catch the offender. Also important to anticipate how the offender will respond to various investigation efforts, and how they should be interviewed if they are caught
5.Crime assessment - a written report is given and matching profiles are evaluated. If new info is generated or no suspect is identified the process goes back to step 2
- Apprehension - if a suspect is apprehended, the entire profile-generating process is reviewed to check that at each stage conclusions made were legitimate, and to consider how the process may be revised for future cases
Evaluate the top-down approach for offender profiling?
Organised-disorganised types of offenders originated from data collected from data gathered by interviews with the most dangerous murderers e.g. Ted Bundy - data used to identify key characteristics that would help police ‘read’ a crime scene
-problematic as these individuals are highly manipulative and unreliable, nor are they typical offenders
-Can be argued that the approach is not scientific. The Barnum effect can explain the believability of profiles based on this approach - ambiguous descriptions can be made to fit any situation - may expect in a list of 20 statements about a person, 10 will be correct, explaining why profiles appear to be right - can mislead investigation if they are wrong
Disorganised/organised offenders may have little distinction
-descriptions are generalisations
-offenders can be a mixture of both
-third category proposed called ‘mixed offender’ but others argue this then lessens the significance of the other 2
-39 aspects of serial killings in US serial killers were analysed and it was revealed no clear division between organised/disorganised
-found a number of subsets of organised-type crimes and little evidence for disorganised
Describe the bottom-up approach developed by David Canter (investigative psychology)
Investigative Psychology:
- Interpersonal coherence
- Ppl are consistent in behaviour + therefore there will be links with elements of the crime + how ppl behave in everyday life
-peoples behaviour also changes over time so crimes may be different over time - Forensic awareness
- behaviours may reveal an awareness of particular techniques and past experience e.g. rapists who conceal fingerprints often had a previous conviction for burglary
3.Smallest space analysis
- statistical technique developed by Canter and used on the Railway Rapist case
-data about many crimes and offender characteristics are correlated so that the mot common connections can be identified
-Canter analysed 48 crime scenes from 82 UK murder cases where the victim was a stranger
-identified 3 underlying themes:
- Instrumental opportunistic = using murder to obtain something/accomplish a goal in the easiest way possible
-Instrumental cognitive = a particular concern about being distracted and therefore more planned (less evidence)
- Expressive impulsive = uncontrolled, in the heat of strong emotions, may feel provoked by the victim
Evaluate the bottom-up approach (investigative psychology)
approach considered more scientific than top-down approach as it uses objective statistical techniques and computer analysis
-issue as the techniques are only as useful as the data inputted into them and the underlying assumptions that are used to work out links between the data items
-data used to link such systems often links to offenders that have been caught and so tell us little about patterns of behaviour linked to unsolved crime.
-how do we know the formula used in computer analysis is correct?
-approach has the potential to be objective and scientific but in practice it can be biased
Describe the geographical profiling part of the bottom-up approach
believed offenders reveal themselves by the locations they choose
-about where the crime took place rather than who committed it
-offenders likely to commit crimes near their local area as it is less effort
-analyses locations of a connected series of crimes and how they might relate to an offender’s homeplace
Involves 2 parts:
-Circle theory = most offenders have a spatial mind-set, they commit their crimes within an imagined circle
- marauder= the offender’s home is within the area in which the crimes are committed
- commuter= offender travels to another area and commits crimes within a defined space around which a circle can be drawn
-Criminal geographical profiling= a computerised system where a formula produces a three-dimensional map, displaying spatial data related to time, distance and movement to and from crime scenes
-map is called a jeopardy surface
-different colours indicate closeness to a crime scene
Evaluate the geographical profiling part of the bottom-up approach
-researchers studied 45 sexual assaults and showed support for the circle theory by distinguishing between marauders and commuters
-91% classed as marauders - most offenders are marauders so classification system appears less useful
-if a person’s home is not in the centre of the circle, this may mislead police to look in the wrong place
-simplistic as most areas like cities circles are not likely to form
-even if crime is not solved it can provide useful info to help police prioritise their resources
-however cannot identify multiple offenders in the same area + method is limited to spatial behaviour and not any personality traits
Explain the historical approach in biological explanations for offending behaviour (Lombroso)
- known as the atavistic form
-explanation suggests criminal behaviour can arise from certain individuals being born with a criminal personality which is innate
-states offenders possessed similar traits to lower primates which could suggest their criminality
-18 characteristics identified that make up the atavistic type
-Empirical evidence:
-used post-mortem exams of criminals and studied faces of living criminals
-made precise measurements of skulls and other physiological features - known as anthropometry
-examined over 50,000 bodies, in 1 study of 383 Italian criminals, found 21% had one atavistic trait and 43% had at least 5
-Environmental influence:
-idea that inherited atavistic form interacted with a person’s physical and social environment
-deterministic view as it suggests factors such as nature or nurture, outside a person’s control determine whether or not they become a criminal
-identified 3 types of offenders which moved away from the atavistic from being the only explanation for criminality
- Born criminals = atavistic type, identifiable from physical characteristics
- Insane criminals = suffered from mental illness
- Criminaloids = large class of offenders whose mental characteristics predisposed them to criminal behaviour under the right circumstances (e.g. social environment)
Evaluate the historical approach in biological explanations for offending behaviour
- First person to research the criminal rather the crime, prior to his work it was believed crime was a choice, which could be deterred if punished
-believed in more humane punishment and also that biology and environments may remove the option of free will
-research lacked controls
-researched more prisoners than non-prisoners
- if more non-prisoners were researched he would have found that just as many non-prisoners as prisoners with the same characteristics
-without studying female criminality, Lombroso made the androcentric claim that women were less evolved than men, and were passive, low in intelligence and had a maternal instinct - all of which neutralised their negative traits and meant they were less likely to be criminals
-those who were criminals had masculine traits which were beneficial in a man but created a ‘monster’ in a female.
Describe the genetic explanation for offending behaviour
-Raine provides evidence to link genetics to offending behaviour through studying twins, monozygotic (MZ) + dizygotic (DZ). He found a concordance rate of 52% for MZ twins and their behaviour compared to a concordance rate of 21% for DZ twins
-Brunner researched in more detail to find a specific gene
-researched 28 male members of a Dutch family with histories of impulsive + violent crimes
-tested the DNA of these men and found they shared a specific gene which could be used to explain their behaviour
-this defective gene led to the men producing abnormally low levels of the enzyme MAOA, which regulates the metabolism of serotonin levels in the brain + low levels of serotonin are associated with impulsive + aggressive behaviour
Evaluate the genetic explanation of offending behaviour
-Big difference between violent and non-violent crime and how these are explained by genetics
-most genetic research focuses on the link between offending behaviour and violent/aggressive behaviour
-offending behaviour also includes non-violent crimes such as fraud, drug use etc
-therefore bio explanations such as genetics may only account for violent crimes and crimes committed by people with psychopathy who are more likely to commit crimes due to a lack of empathy
-Deterministic = in Tiihonen’s research those with the defective gene were 13 times more likely to have a history of repeated violent behaviour but not everyone with the gene had become an offender
-therefore not everyone will offend even if they have the genetic predisposition
-does not account for individual differences
Describe the neural explanation of offending behaviour
-In USA 60% of prisoners have had a head injury compared to 8% of the population - may be due to nature or nurture
-Raine cited 71 brain imaging studies showing that violent criminals have reduced functioning in the prefrontal cortex, the area involved in regulating emotion + controlling moral behaviour - lowered activity in this area is associated with impulsiveness/lack of control
-Raine also studied the limbic systems in murderers
-the limbic system is a set of subcortical structures such as the thalamus and the amygdala that are linked to emotion
-compared with matched controls, they found abnormal asymmetries in the limbic system.
Describe Eysenck’s theory of the criminal personality
Categorised the criminal personality into 3 traits, where criminals experience them on an extreme level. 60% of the population experience these at a normal level
Extraverts: outgoing, positive, get bored easily, require more external stimulation and so seek it to increase their cortical arousal. Likely to engage in dangerous activities and thrilling crimes like stealing for the thrill
Neuroticists: experience mainly negative emotions rather than positive. Low stability of the sympathetic nervous system -reacts quickly and gets upset easily. May overreact in threatening situations - linked to assault crimes
Psychotics: egocentric, impulsive, lack of empathy, impersonal. May engage in more severe crimes e.g. murder, rape due to aggressiveness and a lack of empathy for others
Eysenck stated people can be born with these traits but their environment means they will never use these traits in a criminalistic way.
Evaluate Eysenck’s theory of the criminal personality
Biological basis - support from twin research
-researcher found a +52 correlation for MZ twins on neuroticism compared to .24 to DZ twins - shows a large genetic component for this trait. Scientific evidence that traits can be inherited. However twins are brought up differently and often treated as 1 person instead of 2, so this could be a reason as to why they display similar personality traits.
Criticism - personality may not be consistent (neurotic at school, calm and relaxed at home) - known as situational theory of personality. 63 students placed in different situations and strangers and family found almost no correlation between the traits displayed by the individuals, questions Eysenck’s theory as this suggests people do not have one type of personality
What is a cognitive distortion and what are the 2 types?
a from of irrational thinking - reality becomes twisted so that what is perceived no longer represents what is actually true
- morality disappears
2 types:
-minimalisation
-hostile attribution bias
Describe and evaluate hostile attribution bias as a cognitive explanation of offending behaviour
-a person will think the worst of others
-e.g. someone smiles at them, they will interpret that they are thinking bad thoughts about them
- negative interpretations may lead to defensive and aggressive behaviour
Evaluation:
-emotionally ambiguous faces shown to 55 violent criminals and compared their responses to matched control of ‘normal’ pps
-faces showed various emotions varying in intensity
-offenders more likely to interpret anger in any picture that only showed slight anger
-concluded misinterpretation of non-verbal cues such as facial expressions may partly explain aggressive-impulsive behaviour in these individuals