Forensic Psychology Flashcards
Outline the top-down approach to offender profiling.
Aims to narrow list of suspects using crime scene and other evidence.
US approach created two types of profile based on FBI interviews with 36 sexually-motivated murderers. Profile based on offenders “way of working” which correlates with social/psychological characteristics.
Organised:
- Planned crime, targets victim, high IQ, skilled job, high control, married.
Disorganised:
- No planning, impulsive, lower IQ, skilled job, high control, married.
FBI profile construction is formed.
Outline the FBI profile construction.
- Data assimilation
- Crime scene classification
- Crime reconstruction
- Profile generation
Give two positive evaluations of the top-down approach to profiling.
- Research support:
Canter et al.
- Analysis of 100 US serial killings using “smallest space analysis”. Revealed subset of behaviours which matched FBI organised profile. Theory has some validity.
=> Counterpoint:
Godwin
- Most killers have multiple contrasting characteristics. Disorganised/ organised may be a continuum. - Wider application:
Meketa
- Top-down profiling applied to burglary, 85% rise in solved cases in US. Two new categories, interpersonal and opportunistic.
Give one negative evaluation of the top-down approach to profiling.
Flawed evidence:
Canter et al.
- 36 interviews is small, not randomly selected, didn’t include different kinds of offender nor standard questions. No sound scientific basis.
Outline the bottom-up approach to offender profiling.
Investigative psychology:
- Bottom-up approach used to generate profile based on crime data. Profile emerges as case continues.
- Statistical analysis of crime scene evidence detects patterns across offences using a database. Features of the offence can correlate with background.
- Analysis based on interpersonal coherence, way offender behaves at the scene reflects how they “interact” with victim.
Geographical profiling:
- Crime mapping used to make inferences about the offender based on location.
- Circle theory, offences form a circle around offender’s home base. Canter and Larkin.
- Two types, marauder and commuter. C & L.
Give two positive evaluations for the bottom-up approach to offender profiling.
- Evidence for investigative psychology:
Canter and Heritage
- 66 sexual assault cases, smallest space analysis, consistent pattern of behaviour for each individual. Supports principles of investigative psychology.
=> Counterpoint:
- Database made up of solved crimes which may have been easy to link, a circular argument. - Evidence for geographical profiling:
Canter and Lundrigan
- Information from 120 US murders, place where bodies left created a circle of gravity pointing to home base.
=> Counterpoint:
- If you have to wait for enough people to die to form possible location, not good approach.
Give one negative evaluation of the bottom-up approach to offender profiling.
Geographical profiling not sufficient alone:
Ainsworth
- Recording of crime may not be accurate, 75% of crimes not even reported. Other factor e.g age and experience also need to be considered.
Outline the biological explanation of offending behaviour (a historical approach).
Lombroso (19th century) laid foundation for profiling, criminals are genetic throwbacks, primitive subspecies. Called “atavistic form”.
Biological as theory states offending behaviour is innate due to lack of evolutionary development.
Criminals can be identified by biological markings, “atavistic” characteristics:
- Narrow sloped brow
- Strong permanent jaw
- High cheekbones
- Facial asymmetry
Different crimes associated with different characteristics e.g gingers = murderers.
Research:
- 383 dead and 3839 alive convicts. 40% of acts correlated with atavistic characteristics.
Give one positive evaluation of the atavistic form.
Lombroso’s theory changed criminology:
- Moved discussion of criminal behaviour away from moralistic towards scientific. The fore-runner to profiling. Scientific contribution?
=> Counterpoint:
- Theory more subjective than objective. Many traits fitted those of African descent. Purely a result of racist prejudices and belief in eugenics.
Give two negative evaluations of the atavistic form.
- Contradictory evidence:
Goring
- A contemporary compared 3000 offenders and non-offenders. Found no physical differences, only trait suggested is that criminals often had lower than average intelligence. - Poorly controlled methods:
Hay and Forrest
- Lombroso did not use a control group, confounding variables not controlled. Social conditions are associated with offending behaviour, likely actual source of findings.
Outline the genetic biological explanation of offending behaviour.
Twin and adoption studies suggest genes predispose offenders to crime. 35% (MZ) versus 13% (DZ) concordance for offending behaviour in male twins - Christiansen.
Candidate genes:
- MAOA = serotonin regulator linked with aggressive behaviour.
- CDH13 = linked to substance abuse and ADHD.
5-10% of severe violent crimes in Finland accounted for by these - Tiihonen et al.
Diathesis stress model:
- Genes + stressor/trigger
Give one positive and one negative evaluation of the genetic explanation of offending behaviour.
Support for diathesis stress model:
Mednick et al.
- 13000 Danish adoptees. Criminal behaviour in those with no biological or adoptive convicted parent 13.5%, one biological parent 20%, both was 24.5%. Both genetic and environmental effect important.
Limitation of twin studies:
- MZs treated more similarly than DZs, this may explain higher concordance.
Outline the neural explanation for offending behaviour.
Neural differences in people diagnosed with APD (many convicted criminals diagnosed).
Less activity in pre-frontal cortex. 11% less grey matter in area which regulates emotion.
Mirror neurons (empathy). Individuals with APD may have empathy register which switches on and off.
Give one negative and one positive evaluation for the neural explanation for offending behaviour.
Support for link between crime and frontal lobe:
Kandel and Freed
- Link between frontal lobe damage and impulsive behaviour/ inability to learn from mistakes.
Link between neural differences and APD is complex:
Farrington et al.
- Male adults with APD also had parent with convictions or displayed physical neglect, traumas could cause both APD and neural differences.
Outline the three personality dimensions in Eysenck’s psychological explanation of offending behaviour.
- Introversion - Extraversion
- Sociable and energetic measure - Neuroticism - Stability
- Anxiety and emotional instability measure - Psychoticism - Sociability
- Anti-social behaviour and susceptibility to psychopathological disorders measure.
Outline Eysenck’s psychological theory of offending behaviour.
Three dimensional personality
Innate biological basis:
- Es have underactive nervous system so seek excitement and activity.
- Ns have reactive SNS so are jumpy.
- P have high testosterone so are aggressive.
Criminal personality:
High N+E+P = criminal personality
Offending behaviour is selfish and concerned with immediate gratification. Sign of immaturity.
High E and N scorers lack ability to learn, less likely to learn anxiety responses to antisocial behaviour.
Personality can be measured using the Eysenck Personality Questionnaire (EPQ).