OCD

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Biological approach to explaining OCD

a) genetic explanations -

Candidate genes - genes which make people vulnerable e.g. 5HT1-D beta gene is implicated in the efficiency of serotonin transfter across the synapse

OCD is polygenic - 230 genes 

Different types of OCD - such as hoarding and religious 

Evaluation: 

1. Twin studies- Nestadt et al reviewed previous twin studies and found a concordance rate of 68% for MZ twins compared with 31% for DZ twins. this strongly suggests a genetic influence on OCD

2. Environmental risk factors - Cromer et al found that over half of OCD patients in their sample had experienced a traumatic event in their past and that the OCD was more severe…

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