Biological explanations for OCD

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Last updated 4:01 PM on 8/4/26
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6 Terms

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three explanations

  • neurochemistry

  • genetics

  • neuroanatomy

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Assumptions

  • assumes that all behaviour can be related to physical changes in the body

  • focus is mainly on the nervous system (notably the brain)

  • views psychological abnormality as an ilness and as a disease

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what do genetic explanations for OCD focus on?

whether individuals inherit a genetic pre-disposition to developing OCD

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Diathesis-stress model

  • certain genes leave some people more likely to develop a mental disorder but it is not certain the one will develop

  • some environmental stressors are necessary to trigger the condition

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concordance rate

  • the probability that a pair of individuals will both have a certain characteristics, given that one of the pair has the characteristic

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twin studies and MZ/DZ twins, what it means for OCD

  • MS twins share 100% of their genes

  • DZ twins share only 50% of their genes

  • If genes do play a role in developing OCD, we would expect to find a higher concordance rate for MZ than DZ