It is an involved analysis of previous crimes to create a profiling of a likely offender.
what are the 4 stages of the top-down approach?
data assimilation
crime scene classification
crime reconstruction
profile generation
data assimilation - e.g police reports, crime scene photographs, pathologist's reports
crime scene classification - can be classified into two typologies: organised or disorganised
crime reconstruction - it clarifies the offender's modus operandi
profile generation - the offender's physical characteristics, behavioural habits and demography
evaluation of the top-down approach
difficult to distinguish between organised and disorganised, e.g some crimes become organised over time- this isn't taken into consideration, categories based on ex sex offenders can't be generalised
what are the psychological principles that assists the bottom-up profiling?
interpersonal coherence, time and place, criminal characteristics, forensic awareness.
interpersonal coherence - there is consistency between the way offenders interact with their victims and others in their life
time and place - position and timing of the place
criminal characteristics - involves placing perpetrador into categories
forensic awareness - certain behaviour may reveal a knowledge of police techniques.
smallest space analysis - is used to plot the relationships between crime scene characteristics on a 2D map
what is geographical profiling?
it analyses locations of a connected series of crimes, and its based on assumption that offenders are more likely to commit crimes near where they live.
• Lombroso’s theory of Criminology suggests that criminality is inherited and that someone “born criminal” could be identified by the way they look.
In a study of 383 dead Italian criminals and 3839 living ones, he found 40% of them had atavistic characteristics.
• These features include: large jaw, high cheekbones,upturned nose, large chins, baldness, long arms and tattoos
MAOA removes the neurotransmittersserotonin, dopamine, and noradrenaline, this leads to lower levels of these neurotransmitters, which can then lead to behavioral problems.
what are the 3 biochemicals that are thought to cause criminal behaviour?
Serotonin, dopamine, noradrenaline
what does dopamine do?
excess dopamine leads to more pleasure when taking drungs
what does serotonin do?
low levels of serotonin cause mood and impulsive actions to be unstable
what does noradrenaline do?
high levels are linked to violence, aggression and consequently crime.
what are the similarities between top-down and bottom-up?
top-down uses previous crimes(interviews), similar bottom-up uses (computer database)
both rely on an analysis of the crime scene to create the profile
long drawn out process in term of finding the actual perpator
what are the diffrences between top-down and bottom-up?
top-down can explain murders only whereas bottom-up can explain a range of crimes.