Biological explanations for crime
- Created by: Rosie666
- Created on: 13-02-19 20:38
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- Biological explanations for crime
- Brain regions
- Amygdala
- Smaller in psychopathic killers
- Linked to fear repsonses
- Damaged orbital cortex in murderers
- Up to 60% of prisoners have brain injuries
- Vietnam war veterans, who injured the front of their head, (planning and decision making) became more agressive
- Amygdala
- MZ/DZ twins
- MZ 52% DZ 12%
- MZ have the same genes. DZ shared about 50%
- Suggests genes are a component
- If crime is purely down to genetics, the concordance rate for MZ should be 100%
- MZ 52% DZ 12%
- Neuro transmitters
- MAOA - lower levels of serotonin - associated with agression
- High levels of serotonin in womb and early childhood, the person becomes insensitive
- Lacks the calming effect of serotonin
- Serotonin has a compulsive control
- Candidate genes
- MAOA gene "warrior gene"
- Links to aggressive behaviour
- Half the population has this gene and so at most it is only a contributing factor
- Jim Fallon has all of these genetic risk factor yet has never committed a crime
- CDH13
- Associated with ADHD and substance abuse
- These genes get triggered by environmental factors (epigenetics)
- MAOA gene "warrior gene"
- Brain regions
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