Forensic Psychology Flashcards
(94 cards)
Cesare Lombroso
Lombroso was a 19th century criminologist
In 1871, he met Giuseppe Villegas, a thief and arsonist
Lombroso found him interesting and after his death, he conducted a post-mortem and discovered that his subject had an indentation at the back of his skull, which he felt resembled that found in apes
In his 1876 book Criminal Man he argued that the criminal is a separate species, one that is found between primitive and modern humans
He claimed criminality was heritable and that a “born criminal” could be determined by the physical shape of their head and face because they have atavistic (primitive) features that are a throwback to an earlier stage of human evolution
In total, Lombrosos examined the facial and cranial features of around 383 dead criminals and 3839 living ones and concluded that 40% of crimina acts could be accounted for by atavistic characteristics
Lombroso’s Own Words on this area
“At the sight of that skull, I seemed to see all of a sudden, lightened up as a vast plain under flaming sky, the problem of thr naure of the criminal - an atavistic being who reproduces in his person the ferocious instincts of primitive humanity and the inferior animals. Thus were explained anatomically the enormous jaws, high cheek bones, prominent supercilliary arches, solitary lines in the palms, extreme size of orbits, handle shaped or sessile ears found in criminals, savages and apes, insensibility to pain, extremely acute sight, tattooing, excessive criminals, love or orgies and the irrestitible craving for evil for its own sake, the desire not only to extinguish life in the victim, but to mutilate bthe corpse, tear its flesh, and drink its blood”
Features of different types of criminals
According to Lombroso you can tell what kind of crime someone will commit by the way they look
For example:
- a thief can be identified by their expressive face, mutual dexterity, and small, wandering eyes
- habitual murderers (serial killers) have cold, glassy stares,bloodshot eyes, big-hawk like noses and curly hair
- rapists have ‘jug ears’ and thick lips
- female criminals are shorter and more wrinkled and have darker hair and smaller skulls than ‘normal’ women
- women who commit crimes of passion have prominent lower jaws
Other physical markers included dark skins, extra toes, extra nipples or extra fingers
Besides physical traits, Lombroso also suggested that insensitivity to pain, the use of slang, tattoos and unemployment were also aspects of the born offender
Lombroso strengths
Lombroso was very influential in a number of ways. He pioneered the use of scientific methods in criminology, this giving the subject a scienfitic credibility. His work heralded the begging of offender profiling. He labelled prisons “criminal universities”, suggesting that prisoners came out much worse than they went in - quite perceptive and relevant today when you look at today’s rate of reoffending
A recent Chinese study has produced research that suggests facial features really can give a criminal way. ID photos of 1856 Chinese men, half of whom had a previous conviction, were entered into any artifice intelligence programme. They found it wrongly flagged in connect men as criminals 6% of the time but correctly identified 83% of the real criminals
Several pieces of reserach suggest that less attractive individuals are more liekly to be convicted. For example, in one mock trial study it was found that when the defendant was attractive, guilty verdicts were found 56% of the time against 76% for unattractive defendant (Castellow et al,1990)
Lombroso’s limitations
There is a cause and effect issue with the Castellow reserach study and others like it. We can’t say with certainty that is the physical appearance of the individual that cuases them to commit criminal acts. It is far more likely that it is the case that juries are less liekly to convict attractive people, not because they are innocent, but because of a psychological effect known as the “Halo Effect” which states that we are far more likely to have positive thoughts and emotions about attractive people than unnatracotve people
Other limitations include:
- not everyone with atavistic features is a criminal and not all criminals have them. For example, Goring (1913) used non-criminal control group and found no significant differences in terms of physical features between criminals and non-criminals
- lack of accuracy due to disfigurement
- extremely deterministic and autumns that we cannot escape destiny
- scientific racism - DeLisi (1912) pointed out that many of the atavistic features defined by Lombroso are specific to people to African descent
Genetic explanation introduction
Genetic explanations propose that offending behaviour is inherited as one or more (polygenic) genes predispose people to commit crimes
- some studies that are used to investigate the effects of genetics are twin and family studies
Genetics: Twin studies
Christiansen (1977) examined over 3,500 twin pairs in Denmark’s and i9dendited concordance rates of criminal behaviour:
- Male MZ = 35%
- male DZ = 13%
- female MZ = 21%
- female DZ = 8%
Raine (1993) reviewed reserach on the delinquent behaviour of twins and found 52% concordance rate for MZ twins compared to 21% for DZ twins
Genetics: twin studies evaluation
One problem with using twin studies to study genetics and behaviour is that we cab’s divide between nature and nurture and most of them have had the exact same upbringing
To overcome this, we can use twins who grew up in different environments and therefore any results that are gained can’t be attributed to nurture
Genetics: Adoption Studies
Crowe (1972) compared a group of adopted children whose biological mother had a criminal record, to control a group of adopted children whose biological mother did not have a criminal record
It was found that if a biological mother had a criminal record, 50% of the adopted children also had one by the time they were 18
In the control group, ony 5% of the adopted children had a criminal record by the time they were 18
This suggests that regardless of the changed environment, children seemed biologically predisposed to criminality, so supporting a genetic explanation
Genetics: Candidate Genes
Brunner et al. (1993) conducted an analysis if a large family in the Netherlands, a number of which had been responsible for various counts of anti-social and criminal behaviour including attempted rape, exhibitionism and arson
The researchers found that the males had a genetic condition with a defective MAOA gene (females only carry this condition), which causes a deficiency in monoamine oxidase A (MAOA), an enzyme responsible for the metabolism of neurotransmitters such as serotonin
- so a defective MAOA gene
- abnormal levels for MAOA enzyme
- abnormal serotonin levels
- unregulated moods and possible criminal behaviour
A more recent genetic analysis of almost 800 Finnish offenders found evidence of not only low MAOA activity, but also low activity from the CDH13 gene
This gene is involved in the communication between brain cells and is linked to the control of impulsive behaviour, substance abuse and ADHD
The analysis found that about 5-10% of all severe violent crime in Finland is attributed to the MAOA and CDH13 genotypes
The conclusion here is that individuals can inherit genetic conditions which make them prone to offending behaviour
Genetics: Diathesis-stress (model)
If you have a genetic-vulnerability to something and you experience the environmental factors (triggering events) you are most likely to develeop it
The graph to illustrate this is a positive linear graph
These could be applied to criminal behaviour in:
- upbringing
- alcoholism/drug abuse
- adverse childhood experiences
Genetics: Diathesis-stress Evalution
One strength is that there is support for the diathesis-stress model for offending behaviour
For example, a tidy of 13,000 Danish adoptees was conducted by Mendick et al. (1984)
The findings were as follows:
- when neither the biological no adoptive parents had criminal convictions, 13.5% of the adoptees did
- when either the biological parents or adoptive parents had criminal records, 20% of the adoptees did
- when both the biological and the adaptive parents had crimina convictions, 24.5% of the adoptees did
This provides support for the diathesis-stress model by giving the theory external validity escpaically in such a big group
However, it is important to note that while this study does show an increase in criminal behaviour in accordance of the model there were over 75% of adoptees who didn’t have any criminal record as all, suggesting that this doesn’t always apply
Genetics: General Evaluation
One limitation is that most of the genetic reserach on criminal behaviour looks at a limited range of criminal behaviour
For example, crimes such as those involving violence and psychopathy
This is a limitation because criminal behaviour includes a wide range of crimes such as theft, fraud and drug abuse. This means that a genetic explanation of crime needs to do further reserach into the link between genes and non-violent crimes in order for it to be seen as a moe ‘complete’ theory
A second limiations is that genetic explanations are presented as if the genes a person is born with determine later behaviour
For example, the lawyers of Stephen Mobley (who murdered the managers of a Domino’s in Gerogia, USA) argues thar as his family history showed many previous generations with violent behaviour then he should be tested to see if he had the criminal variant of the MAOA gene, which would mean he was therefore ‘born to be a criminal’ and couldn’t be held responsible for this behaviour
This is a limiation because our genes do not fully determine our behaviour. Not all people who are brown with ‘criminal genes’ go on to commit offences. The judge in the case of Mobley agrees with this and this was not used as a defence. He was executed in 2005
One strength of the genetic explanations is that they can have practical applications
For example, if children have parents who have violent criminal records, this could suggest that they may have inherited the ‘criminal genes’ and therefore targeted interventions such as therapies, behaviour modification therapies (e.g. anger management) or support groups could be put into place to help the child and nature that they don’t go on to show criminal behaviour
This is a strength because it shows that people can be helped due to this theory, and crime rates could be lowered by doing so
Neural explanations: introduction
Evidence suggests that there may be differences in the brains of offenders and non-offenders
Neural explanations of offending behaviour can be separated into neurochemcial and neurophysiological
- neurochemcial refers to the chemical processes occurring the the nerve tissue and the nervous system (e.g. neurotransmitters in the brain)
- neurophysiology refers the the physiology of the nervous system (physiology is a branch of biology that deals with how the body works) and looks at the structure of the brain
Neurochemcial explanations
There are several neurotransmitters that have been linked to criminal behaviour
Serotonin - abnormal levels can cause you brain to over or under function and effect processes such as impulse control
The CDH13 and the MAOA gene can effec t the enzyme levels that break down serotonin and therefore causing high leaves of it, meaning that neural signal sent to regularly
Dopamine - in some cases, increases in dopamine can cause increases in certain behaviours such as aggression and impulsivity
This can be exaggerated with people whop have deficits ton their reward system and don’t gain pleasure from normal pleasurable activities and instead gain pleasure from criminal behaviour
This causes an increase in repeating the criminal behaviours to gain pleasure
Neurochemcial explanations evaluation
Strength - Scarborough and Raine (1993), found abnormally low levels of serotonin in 29 studies examining offending behaviour
Strength - Cherek et al (2002) investigated the levels of impulsivity and aggression in males with a history of conduct disorder and criminal behaviour. Half received a placebo for 21 days whereas the other half were administered paroxetine (an SSRI antidepressant). Those who received paroxetine showed a significant decrease in impulsive responses, and aggression declines by the end of the study
Limitation - the issue of cause an effect. A lot of this research is done on people who have been caught and are in prison. So is the low serotonin what is causing the offending behaviour (which is what this theory suggests) or is it that offending behaviour results in prison time which results in depression, which is also associated with low serotonin levels and activity?
Neurophysiological: Amygdala
One part of the brain implicated in offending behaviour is the amygdala, which is part of the lambic system
The amygdala was first implicated in emotional behaviour by Papez (1937) and Maclean (1952). It is highly connected: it is neurally linked to the hypothalamus, the hippocampus and the prefrontal cortex in addition to other parts of the brain
It therefore has a widespread influence on brain functioning and ultimately on behaviours associated with emotion, motivation and social interaction
It plays a major role in how we assess and respond to environmental threats, hence its importance in determining aggressive behaviour
It has been suggested that the amygdala dysfunction plays a role in criminal behaviour
Amygdala dysfunction:
- reduced amygdala dysfunction - proactive aggression - cold blooded, planned, premeditated - e.g. first degree murder
- increased amygdala function - reactive aggression - hot blooded, angry, spontaneous
Neurophysiological: Amygdala Evolution
Strength - Glenn et al (2009) studied 17 ppts (small sample size) with varying degrees of psychopathy. They underwent fMRI scans of their brain while making judgements about dilemmas such as “should you s,other your crying baby to save yourself ans others hiding from terrorists who may be alerted by the sound?”(doesn’t happen everyday). An association between psychopathy and reduced amygdala activity during decision-making in emotional moral dilemmas such as these
Strength - Cocsro et al (2007) investigated the effects of he amygdala on aggression. By studying people with intermittent explosive disorder. They were asked to view images of faces at the same time as having an fMRI of their brain. Compared to non-IED controls, the participants with IED showed high levels of amygdala activity when they viewed angry faces (an everyday signal of a threat)
Neurophysiological: Frontal lobes
Other brain areas besides the amygdala are also important
Another part of the brain linked with offending behaviour is the control lobes
These have been linked to higher functions such as self-control, regulation of impulsive behaviour and inhibiting aggression
Raine et al (1997) studied 41 violent offenders and compares the activity in their prefrontal cortex to 41 non-criminals (including 6 schizophrenics) using PET scans
The violent offenders showed significantly less activity in prefrontal lobe than the other ppts suggesting less control over impulsive behaviour
The pre frontal lobe develops relatively late, sometimes not fully developed until early 20s and later in males
This may explain the peak in antisocial behaviour by male teenagers and young adults
Neurophysiological: Frontal lobes evaluation
Strength - Brower and Price (2001) found a link between frontal lobe dysfunction and violent crime
Strength - Kandel and Freed (1989) looked at frontal lobe damage and anti-social behaviour, findings that there was a tendency for such individuals to exhibit emotional instability,a failure to consider the consequences of their actions or to adapt their behaviour in response to external cues. These traits would seemingly be a result of impaired functioning in the frontal lobes, a region responsible for planning behaviour
Limitation - the nature of some research into neurophysiology is often correlational, which means that there is no clear way to show cause and effect. For example, the structural brain abnormalities found in Raine et al (1997) could be a cause of offending behaviour or the result of some environmental factor, which in turn makes them moe likely to come a criminal. This matters because it highlights the complexity of the relationship between biology and behaviour and suggests that further investigation is requires
Eysenck’s theory of the criminal personality
Hans Eysenck (1947) developed what is now a well-established theory of personality by analysing the results of responses to a personality questionnaire of 700 soldiers who were bind treated for neurotic disorders (anxiety disorders, likely PTSD due to being in war) at the mental hospital where he worked
He believe that personality traits are biological in origin and come about through the type of nervous system we inherit
His initial theory suggested that personality can be measured on two dimensions:
1. Introversion-extraversion (E)
2. Neuroticism-stability (N)
He later added a third dimension
3. Psychoticism-stability (P)
Introversion/extraversion
Extraverts (E) are sociable and lively but become bored very quickly while introverts (I) are more reserved and quiet and more in control of their emotions
Extraverts have an underactive nervous system (specifically cerebral cortex - low levels of arousal) which means they constantly seek excitement, stimulation and are likely to engage in risk-taking behaviours
They a;sp tend to no condition (learn) easily and therefore are less likely to learn from their mistakes
Neuroticism/stability
Individuals in high neuroticism (N) have high levels of anxiety and can be moody, irritable and irrational
Those high in stability (S) are more controlled and even tempered
Neurotic individuals have a high level of reactivity in the sympathetic nervous system (ANS - autonomic nervous system)
- they respond very quickly to situations of threat (fight-or-flight)
This means they tend to be nervous, jumpy and over anxious and their general instability means their behaviour is often difficult to predict
It is also thought that this affects the limbic system which control emotions and emotional response which leads to more irrational responses e.g. aggression
Psychoticism/normality
Those high in the psychoticism (P) scale are impulsive, aggressive, cold and uncaring
They are suggested to have higher levels of testosterone and are unemotional and prone to aggression
Also likely to have an overproduction of dopamine which leads to them being more impulsive and aggressive