Evaluation

• Evaluate good supporting evidence

  • People are more vulnerable to OCD as a result of their genetic make-up
  • Nestadt et al 2010 reviewed twin studies:
  • 68% of identical twins shared OCD
  • 31% of non-identical
• evaluate too many candidate genes

  • psychologsts cannot determine all the genes that are involved, because there are several of them.
  • also, genetic variation only increases the risk of OCD by a fraction.
  • genetic explanations may not be useful as it provides little predictive value
• evaluate environmental risk factors

  • cromer et al 2007 found that over half of the OCD patients in their sample had a traumatic event in their past.
  • OCD was more severe in those its more than one trauma.
  • OCD cannot be entirely genetic in origin