A2 Addiction mind map

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  • Created by: mollyb
  • Created on: 14-06-13 15:49
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  • Biological model
    • reward system/ mesocorticolimbic system/ common reward pathway
    • humans have a reward system in the brain which is a network of cells which that releases dopamine every time you do a rewarding behaviour
    • dopamine is seen as a reward and a behaviour that is rewarded is more like to reoccur
    • also seen in gambling and when a person frequently gambles or takes a drug too much dopamine in released for too long
    • as an addict becomes used to the drug they no longer feel life rewarding without the drug and this is a huge negative effect
    • Small et al
      • found eating chocolate also activated the MDP and increased dopamine. Was also activated when someone even thought about chocolate. Drugs also activate the MDP in the same way.
    • Ginovart et al
      • used PET scanning to count the number of dopamine receptors in the brain of animals given amphetamines and found that the number of D2 receptors decreased as animals created a tolerance
    • Overstreet et al
      • some rats were more genetically at risk for alcohol addiction than others.
    • Van den Bree et al
      • found that MZ twins were more likely to be both addicts than non identical twins. this was particularly true for male twins and supports the idea that genetics play a role in addiction
    • IDA
      • cannot be generalised to humans
      • does not include psychological factors, therefore must all be biological however not true
      • simplistic and reductionist

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