16 Forensic Psychology Flashcards
Define offender profiling.
Offender profiling is a tool employed by the police to narrow down a list of suspects. It is based on the idea that characteristics of the offender can be deduced from details of the offence and crime scene.
Briefly outline top-down approach to offender profiling.
- Templates of organised offender and disorganised offender are pre-existing in the profiler’s mind
- Evidence from the crime scene and other details of the crime, victim and context are used to place the offender into one of two pre-existing categories
Describe features of an organised offender.
- Show evidence of planning the crime in advance
- Usually has a preference for a certain type of victim
- High level of control and operate with almost detached surgical precision
- Leaves little evidence behind at crime scene
- Above average intelligence
- Socially and sexually competent
- High-level, skilled profession
- Often married with children
Outline features of a disorganised offender.
- Little evidence of planning suggesting it was spontaneous
- Crime scene reflects impulsive nature of the offence
- Body may be left at the scene
- Little control on the offender’s part
- Lower than average intelligence
- Low-skilled profession or unemployed
- History of sexual dysfunction and failed relationships
- May live alone close to the crime scene
Evaluate top-down approach with four weaknesses.
DIS 1: Only applies to certain crimes
- Can only be applied to certain crimes such as arson, cult killings, rape etc.
- Or murders involving macabre practices like torture or dissection
- Common offences like burglaries do not lend themselves to top down
- Crime scene reveals little about the offenders
DIS 2: Small sample
- This organised and disorganised distinction was developed based on interviews with 36 serial killers in the USA
- The sample is too small and unrepresentative to based a whole topology system of criminal types on
DIS 3: Invalid self-report data
- Top-down profiling was based on interviews with 36 sexually motivated serial killers including Ted Bundy and Charles Manson
- It is not valid to rely on self-report data from convicted serial killers and create a classification system from it
DIS 4: 4 types of serial killers
- Overly simplistic to categorise offenders into only two categories
- Holmes (1989) suggests four types of serial killers:
- Mission = killing to eradicate a certain group of people
- Visionary = killing because God or the Devil told them to
- Hedonistic = killing for the thrill
- Power = killing to exert control over their victims
Briefly describe bottom-up approach to offender profiling.
- Aim is to generate a picture of the offender including their likely characteristics, routine behaviour and social background
- Through systematic analysis of evidence left at the crime scene
- Profile is data driven and emerges as the profiler engages in rigorous scrutiny of details of the offence.
What is investigative psychology?
Aims to establish behaviours likely to occur at certain crime scenes to create a statistical database acting as a baseline for comparison
Describe interpersonal coherence as a central concept of investigative psychology.
- Interpersonal coherence is that the way an offender behaves at a crime scene such as interaction with victims reflects the way they act in everyday life.
- e.g. A rapist may want to control and humiliate their victims or be apologetic.
- This could tell the police how the offender relates to women
Describe forensic awareness as a central concept of investigative psychology.
- Forensic awareness describes individuals who have made an attempt to cover their tracks
- Their behaviour may indicate that they have been the subject of police interrogation in the past
- So they may already have their DNA or fingerprints on file to match against evidence at the crime scene
Outline geographical profiling.
- Geographical profiling is the study of spatial behaviour in relation to a crime and offenders
- Focuses on location of crime as a clue as to where the offender may live, work or socialise
- Relevant data includes: crime scene, local crime stats, local transport ad geographical spread of similar crimes
- Offender’s base is typically in the middle of the spatial pattern of the crimes
- Marauders operate close to their home
- Commuters travel a distance from their home and operate there
Evaluate bottom-up approach to offender profling.
ADV 1: More scientific
- More grounded in evidence and psychological theory
- Less driven by speculation and hunches
ADV 2: Range of offences
- Not limited to certain crimes like top-down approach
- Can be applied to burglary and theft as well as murder and rape
DIS 1: Failure in use
- In 1992 a 21 year old women was stabbed several times and sexually assaulted
- In 2008, a man was finally convicted
- He was ruled out early on in the initial investigation because he was several inches taller than the profile claimed the offender to be
DIS 2: Copson (1995)
- Survey of 48 police forces
- Advice provided by profiler was only useful in 83% of cases but only 3% lead to accurate identification of the offender
DIS 3: Chemistry students
- Chemistry students provided a more accurate offender profile than experienced seior detectives
- Bottom up approach is a little more than common sense and guesswork.
Describe atavistic form as an explanation for forensic psychology.
Criminals are genetic throwbacks - a primitive sub-species who were biologically different to non-criminals. They can be identified by a set of particular physiological characteristics to certain crimes.
- Narrow, sloping brow
- Strong, prominent jawline
- High cheekbones
- Facial asymmetry
- Dark skin, extra toes, nipples, fingers
- Murderers = bloodshot eyes, curly hair, long ears
- Sexual deviants = glinting eyes, swollen/fleshy lips, projecting ears
- Fraudsters = thin, reedy lips
Evaluate atavistic form as an explanation for criminal behaviour.
ADV 1: Forerunner for bio exp.
- Important role in shifting away from theories based on feeble-mindedness, wickedness and demonic possession
- Forerunner to more biological explanations (evolutionary influences and genetics)
DIS 1: Distinct racist undertones
- Many atavistic features are likely to be found in people of African descent
- His claim that atavistic characteristics were uncivilised, savage and primitive support eugenics philosophy
DIS 2: Goring (1913)
- Lombroso did not compare to non-criminal control group
- Study to establish if there were any physical or mental abnormalities among criminals
- Comparison of 3000 criminals and 3000 non-criminals
- No evidence that offenders have particular facial and cranial characteristics
- However, offenders did have lower intelligence
DIS 3: Other factors for atavistic
- Facial and cranial features can be influenced by poverty or poor diet
- These can lead people to crime
Outline genetic explanations for offending.
- Criminal behaviour could be polygenic - no one single gene responsible
- Genetic analysis of 900 Finish offenders revealed two candidate genes for criminal behaviour
- MAOA gene controls dopamine and serotonin and is linked to aggressive behaviour
- CDH13 gene is linked to substance abuse and ADD
- High-risk combination of genes means you are 13 times more likely to have a history of violent behaviour compared to a control group
- Diathesis-stress model suggests that tendency towards criminal behaviour is a combination of genetic predesposition and biological/psychological triggers like being raised in a dysfunctional environment
Describe neural explanations for offending.
- APD is a condition that characterises many convicted criminals
- APD is associated with reduced emotional responses and lack of empathy
- Raine et al (2000) found 11% reduction in volume of grey matter in prefrontal cortex of people with APD
- Pre-frontal cortex regulates emotional behaviour
- Criminals with APD experience emapthy but only sporadically
- Only when asked to empathise with a person experiencing pain on a film did the criminals’ empathy reaction activate
Evaluate genetic and neural explanations of offending.
DIS 1: Raine et al (2000)
- Brain scanning studies show pathology in brains of criminal psychopaths
- Cannot conclude whether abnormalities are genetic or signs of early abuse
DIS 2: Too vague
- There are a huge variety and range of crimes
- Specific offences may be more biological than others e.g. physical aggression
DIS 3: Biological reductionism
- Criminality is complex and these theories reduce offending behaviour to a gene or neurotransmitters being overly simplistic
- Crime may run in families but so does emotional instability, mental illness, social deprivation and poverty
DIS 4: Biological determinism
- Theories suggest we have no control over our criminal behaviour
- Dilemma for legal system
- If someone has a criminal gene they shouldn’t have personal and moral responsibility for their crime otherwise it would be unethical as they don’t have free will
Describe Eysenck’s Criminal Personality as an explanation for offending.
- Eysenck proposed that behaviour can be represented by two scales of introversion/extraversion and neuroticism/stability
- The criminal personality type is neurotic-extravert
- Extraverts have an underactive nervous system so they are constantly seeking out excitement and stimulation and may engage in risk-taking behaviour
- Neurotic people tend to be nervous, jumpy and over-anxious
- Overall instability means behaviour is difficult to predict
- High extraversion and neuroticism makes them difficult to condition as children hence more likely to act antisocially in certain situations