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Thoughts Recurring

Disturbing Automatic

Reduces anxiety Behaviours

Compelled to perform
Biological explanation
Genetic factors 10% of OCD suffers had relatives with OCD
1.9% had no OCD relatives (Pauls et al. 1995)
Family studies indicated predisposition to the illness ( tendency to
develop illness)
Biochemical factors related to low levels of…

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Can account for both cause and maintenance
Twoprocess theory led to effective treatment

Cognitive Explanation
OCD have obsessive thoughts cause great anxiety
Cognitive bias make them `hypervigilant' when attending environmental
More likely attend to threatrelated stimuli
Unable to banish unwanted thoughts ­become more vivid and intolerable
OCD sufferers…


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