Forensic Psychology Flashcards
Offender Profiling
An intestigative technique by which we identify the major personality and behavioural characteristics of the offender based upon an analysis of the crimes committed
Top Down Approach
Uses the experience and intuition of a profilier, starts with pre-existing categories and goes to evidence.
- contains 7 decision-making tools
7 Decision-Making Tools in Top Down Approach
- Murder Type
- Primary Intent
- Victim Risk
- Offender Risk
- Escalation
- Time
- Location
Murder Type
- Isolated (a one-off)
- Serial (3+ in at least a month with gaps in between)
- Mass (several in one location at one time)
- Spree (several in different locations but at one time)
Primary Intent
Whether the murder was premeditated or not
Victim Risk
Was the victim high or low risk to the offender (vulnerability)
Offender Risk
Is there a high or low risk to the offender?
Escalation
Is there evidence that the crime has escalated from previous offences
Time
When was the crime committed?
Location
Where was the crime committed?
Organised Behaviour
- planned the crime
- high self control
- leaves little evidence
- deliberately targets victim/type of victim
Organised Profile
- highly intelligent
- skilled/professional occupation
- socially & sexually competent
- usually married/living with partner
- often eldest child/highest birth order)
Disorganised Behaviour
- little to no planning for the crime
- little self control
- leaves lots of evidence
- victim is often random
Disorganised Profile
- below average intelligence
- unskilled jobs/unemployed
- socially & sexually inadequate
- often lives alone or with parents
- lower birth order (youngest)
4 Main stages to contruction of an FBI profile
Data Assimilation
Crime Scene Classification
Crime Reconstruction
Profile Generation
Bottom Up Approach
Analyses evidence in comparison to evidence from previous crimes
- investigative psychology
- geographical profiling
Investigative Psychology
Use of statistical techniques alongside theory to analyse crim e scenes and establish patterns of behaviour
- uses 5 basic assumptions to help establish a profile
5 Investigative Psychology Assumptions
- Interpersonal Coherence
- Time & Place
- Criminal Characteristics
- Criminal Career
- Forensic Awareness
Interpersonal Coherence
Assumption that behaviour is consistent across situations and everyday behaviour is similar to the way a crime is commited
Time & Place
Positioning and timing of crimes give an indication as to where the perpetrator might live or work
Criminal Characteristics
Placing criminals into categories e.g. types of offences
Criminal Career
Considers how far into their criminal experience offenders are, and how their pattern of crime might progress
Forensic Awareness
Offenders who show an awareness of forensic investigation
Geographical Profiling
Generalising from the location of the crime-scenes to the likely home base of the offender, through crime-mapping
- based on the assumption that most offenders like to operate in areas they know well
- 4 main principles to help shape a profile
4 Principles in Geographical Profiling
- Locatedness
- Systematic Crime Location Choice
- Centrality
- Comparative Case Analysis
Locatedness
Some crimes have several locations whihc include where the victim is met initially, where the attack occus, where the victim is actually killed and finally where the body is disposed of
Systematic Crime Location Choice
Non-random locations where familiarity to the offender is importrant
Centrality
Two types of offenders: commuters & marauders.
- Communters travel to commit the crime
- Marauders commit crimes close to home
Comparative Case Analysis
Consideration that other crimes may be committed by the same offender.
- The reason why this connection is actively sought is that the more crimes that are committed by one particular person, the greater the accuracy and application of geographical profiling
Atavistic Form/Historical Approach
Proposed by Lombroso in 1870s
- Focused on the physical makeup of offenders
- Argued offenders were a biologically distinct group with primitive physical characteristics
Christiansen (1977)
studied 3586 twin pairs from denmark & found cc rates of 35% for mz & 13% for dz MALE TWINS
Adoption Studies
Compare adopted children to biological and adopted parents to see whether the environment or genes have an effect
Mednick et al (1990)
USed data form an adoption data bank in denmark compared conviction rates
- found 20% of adoptees whos bio parents had conviction & adop. parents didnt
- found 13.5% of adoptees who had convictions but whos birth & adop. parents did not
Neural Explanations
Neural differences have been found between the brains of criminals and non-criminals: biochemistry & brain physiology
Serotonin
Regulates mood & impulse control (impulsive aggression)
- low levels implicated with failure to control impulsive aggression & may lead to violent offending
Dopamine
Linked to pleasure
- high levels in limbic system from substance abuse leads to increased pleasure, leading to addiction
- there’s a positive correlation between addiction & offending
Limbic System
Reduced activity in the limbic system may be linked to a lack of emotional control which would be linked to offending due to a lack of remorse
- people with APD have lowered activity in the limbic system
Noradrenaline
Helps us respond to a threatening situation (f/f)
- high levels are associated with aggression & thus violent crime
Brain Physiology
Much evidence for the link between brain physiology & offending has come from people diagnosed with Antisocial Personality Disorder (APD).
- APD is associated with reduced emotional responses & lack of empathy for feelings of others
LIMBIC SYSTEM & PREFRONTAL CORTEX
Eysenck’s Theory
Suggests that crime arises from certain innate personality traits.
Our personality is determined by the type of nervous system we inherit & varies across 2 dimensions: INTROVERT/EXTROVERT & NEUROTIC/STABLE (& PSYCHOTICISM/SOCIALIBILTY)
Prefrontal Cortex
Reduced activity and/or reduced grey matter in prefrontal cortex may be linked to a lack of regulation of emotional behaviour.
- may be linked to a lack of guilt or conscience and thus may lead to offending as this usually acts as a ‘brake’ stopping offending yet it isn’t present in those with APD
Criminal Type
Neurotic-Extravert who also scored highly on Psychoticism
Extraversion
- Sociable, impulsive, expressive & risk-takers
- Seek stimulation/excitement from environment
- Have under-aroused nervous systems, linked to the level of cortical arousal in the brain. So person will seek stimulation from the environment to raise the level so are more likely to engage in risk taking behaviours —> offending
- Do not condition easily so don’t learn from their mistakes
LOW RESIDUAL LEVEL OF ACTIVATION > SEEK STIMULATION > MORE LIKELY TO RISK-TAKE > MORE LIKELY TO OFFEND
Neuroticism
- Emotionally unstable, anxious & unpredictable
- Linked to the Sympathetic Nervous System
- React quickly & more to stress and becoeme unstable. behaving unpredictably
- More likely to commmit crimes in emotionally charged situations
Psychoticism
- Cold, uncaring, lack empathy, weak conscience (little guilt felt), and aggressive
- High levels of androgens (like testosterone) may be implicated which are linked to aggression & may lead to aggressive crime as they feel little guilt