Biological Explanation for OCD
Biological explanation of OCD
Real World
Identical twin studies, such as those by Nestadt et al. (2010), found ~65% concordance for OCD in MZ twins versus ~25% in DZ twins, suggesting a strong genetic component — yet the gap below 100% shows environment also plays a role.
Exam Focus
When evaluating biological explanations, always contrast MZ vs DZ concordance rates as evidence for genetic influence.
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