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Biological approach to explaining OCD (NEURAL)

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AS - Level Psychology Mindmap am Biological approach to explaining OCD (NEURAL), erstellt von Jess Hughes am 04/05/2016.
Jess Hughes
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Jess Hughes
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Biological approach to explaining OCD (NEURAL)
  1. Abnormal levels of neurotransmitters
    1. Dopamine is abnormally high in those with OCD
      1. Animal studies
        1. High doses of drugs enhancing levels of dopamine, induce stereotyped behaviour of OCD
        2. Lower levels of serotonin are associated with OCD
          1. Antidepressants increasing the serotonin levels have proved effective in treating OCD
        3. Abnormal brain circuits
          1. Several areas in the frontal love have been thought to be abnormal in those with OCD.
            1. Caudate nucleus normally supresses signals from the orbitofrontal cortex.
              1. The OFC sends signals to the thalamus about worrying things, i.e. germs.
                1. When the caudate nucleus is damaged, it fails to supress minor worry signal and the thalamus is alerted, sending signals back to OFC and acting as a worry circuit.
            2. Supported by PET scans taken while symptoms are active, i.e. holding a dirty cloth, showing the OFC to be active
              1. Serotonin and dopamine are linked to those areas of the frontal lobes and serotonin is thought to play a key role in the operations of the OFC.
                1. Abnormal serotonin levels may also cause areas to malfunction.
                  1. Dopamine is linked too as it is the main NT of the basal ganglia and high levels of it lead to over activity in this region
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