Forensic Psychology Flashcards
!! OFFENDER PROFILING !!
top down
bottom up
what are the 2 types of offender profiling
top down approach
bottom up approach
what is the top down approach described as
a qualitative approach to offender profiling due to looking at the overall picture and using typologies
what is the top down approach based on
based police experience and case studies rather than psychological theory
in-depth interviews by the FBI with 36 sexually motivated serial killers
what type of crime was the top down approach suitable for
suitable for more extreme/unusual crimes
E.G. murder, rape and ritualistic crime
what are the two types of offenders identified in the top down approach
organised
disorganised
behaviour towards victim (ORGANISED)
victim targeted
controls conversation
behaviour towards victim (DISORGANISED)
victim detected at random
crime unplanned
avoids conversation
crime scene detail (ORGANISED)
weapon absent
body hidden from view
body moved from crime scene
attempts to clean up
crime scene detail (DISORGANISED)
weapon present
sexual activity after death
body left in view at crime scene
characteristics of criminal (ORGANISED)
high intelligence
socially competent
sexually competent
skilled occupation
characteristics of criminal (DISORGANISED)
average intelligence or lower
socially immature
sexually incompetent
poor work history
lives alone
lives close to crime scene
FIRST stage of top down approach
DATA ASSIMILATION
data compiled from police reports, post porters, crime scene photos ect.
SECOND stage of top down approach
CRIME CLASSIFICATION
profilers decide whether the crime scene is organised or disorganised
THIRD stage of top down approach
CRIME RECONSTRUCTION
hypotheses about crime sequence, offender & victim behaviour etc.
FOURTH stage of top down profiling
PROFILE GENERATION
offender’s physical, demographic and behavioural
evaluation of top down approach
simplistic
particular crimes
issues with sample
lack of evidence
simplistic (TOP DOWN APPROACH)
having only 2 categories is very simplistic as it is unlikely that criminals fit neatly into one category
as a result it would be difficult to predict their characteristics
it is likely that there will be more than two types
particular crimes (TOP DOWN APPROACH)
is only useful for crime scenes that reveal information about a suspect e.g. rape
it is not useful for crimes that reveal little about the offender e.g. burglary
issues with sample (TOP DOWN APPROACH)
the sample of 36 killers is too small and unrepresentative for a whole profiling system to be based on
self report methods were also used
could be unreliable as they are conducted by criminals
lack of evidence (TOP DOWN APPROACH)
Canter et al. (2004) analysed 100 murders
found that there was no evidence for the existence of a disorganised type
HOWEVER.. there was some evidence for an organised type
what it the bottom up approach based upon
investigative psychology
geographical profiling
investigative psychology
uses computer databases and statistical procedures
looks at similarities and differences in patterns between offences and offenders
interpersonal coherence (investigative psychology)
the way in which an offender behaves at the scene
how they interact with the victim may indicate how they act in everyday life
significance of time and place (investigative psychology)
may indicate where the offender is living if the crimes take place within the same forensic “centre of gravity”
forensic awareness (investigative psychology)
focuses on those who have been the focus of police attention before
their behaviour may denote how mindful they are of covering their tracks
geographical profiling
Rossmo (1997) stated that an offenders operational base is revealed by the geographical location of their previous crimes
known as crime mapping
circle theory (geographical profiling)
Canter and Larkin (1993) proposed two models of offender behaviour
the offending pattern with most likely form a circle around their home and give investigators an idea of their ‘mental maps’, mode of transport etc.
the marauder (geographical profiling)
the offender operates in close proximity to their home base
the commuters (geographical profiling)
the offender is likely to have travelled a distance away from their usual residence
evaluation of bottom up approach
other factors
supporting evidence
comparison to top down
mixed results
other factors (BOTTOM UP APPROACH)
there are other factors that need to be taken into account E.G. psychological characteristics
only focussing on location may cause an investigator to miss important information if used by its own
supporting evidence (BOTTOM UP APPROACH)
Lundrigan and Canter (2001) examined 120 murder cases involving serial killers
analysis revealed spatial consistency in the behaviour of offenders
the effect was more noticeable for offenders who travelled short distances
comparison to top down (BOTTOM UP APPROACH)
bottom up can be used for a variety of crimes
has a wider application for use compared to top down approach
more scientific and objective through its use of evidence
now used in suspect interviews and in court trials
mixed results (BOTTOM UP APPROACH)
Copson (1995) surveyed 48 police forces and found that advice provide by the profiler was USEFUL in 83% of cases
only dead to accurate identification of the offender was only 3% accurate
!! BIOLOGICAL EXPLANATIONS !!
atavistic form
genetic explanations
neural explanations
who founded the atavistic form
Lombroso
what did Lombroso suggest
criminals were genetic throwbacks to a primitive sub-species who were biologically different to non-criminals
saw them as savage, untamed and lacking in evolutionary development
Lombroso’s research
examined 383 dead criminals’ skulls and 3839 living criminals
concluded that 40% of crimes could be explained by atavistic form
what physical characteristics did Lombroso associate with murders
bloodshot eyes
curly hair
long ears
what physical characteristics did Lombroso associate with sexual deviants
glinting eyes
swollen fleshy lips
projecting ears
what physical characteristics did Lombroso associate with fraudsters
thin lips
evaluation of atavistic form
father of modern criminology
racism
causation
father of modern criminology (ATAVISTIC FORM)
Lombroso was the first to use a scientific method in classifying criminals
was seen to be the start of modern offender profiling
racism (ATAVISTIC FORM)
most of the characteristics described are most commonly found amongst those of African descent
he would therefore be criticised for using a eugenic and scientifically racist theory
causation (ATAVISTIC FORM)
poverty or poor nutrition could influence facial and cranial differences rather than delayed evolutionary development
we cannot be sure of the cause of these differences and subsequent criminal activity
genetic explanations
candidate genes
twin studies
candidate genes
Tiihonen et al (2014) revelled two abnormalities that can be associated with violent crime
MAOA gene - controls dopamine and serotonin
CDH13 - linked to substance abuse
individuals with this combination were 13 times MORE LIKELY to have a history of violent behaviour
twin studies
Lange (1930) studies 13 MZ twins and 17 DZ twins where one of twins had spent time in prison
10 of the MZ and 2 DZ twins had a second twin who had also spent time in prison
neural explanations
prefrontal cortex
mirror neurons
prefrontal cortex
those who experience antisocial personality disorder show reduced activity in the prefrontal cortex - part of the brain that regulates emotional behaviour
Raine (2000) found 11% reduction in the volume of grey matter in PFC of people with ADP compared to control groups
mirror neurons
Keysers (2011) found that only when criminals were asked to empathise did their empathy reactions activate
suggests that criminals do experience empathy, it is just not an automatic response
evaluation of genetic and neural explanations
diathesis stress model
determinism
validity
diathesis stress model (GENETIC AND NEURAL EXPLANATIONS)
Mednick (1984) studies 14,427 Danish adoptees
found that a percentage of adoptees who had criminal convictions was highest if they had both adoptive and biological adoptive parents with convictions
suggests BOTH genetic and environmental causes are important
determinism (GENETIC AND NEURAL EXPLANATIONS)
biological explanation had implications for the legal system
negotiates free will and gives a defence to those who claim to have a ‘criminal gene’