- Healthy controls： 1:1 match with the OCD group in age, gender and level of education; Never appear symptoms of OCD, not comply with obsessive compulsive disorder, or other mental disorders DSM-Ⅳ diagnostic criteria; There is no history of psychiatric medication; No two lines three generations of history of mental disorder; Has enough of seeing and hearing level to complete the necessary checks; Right-handed (this standard is limited to magnetic resonance imaging (MRI) detection); The Han nationality (this standard is limited to genetic testing); Willing to participate in this study.