The Efficacy of Temporal Interference Stimulation in the Treatment of Obsessive-Compulsive Disorder

Inclusion Criteria: * 18-50 years old * Diagnosis of OCD per DSM-5 * Y-BOCS score ≥20 * Have a documented history of at least two adequate trials of selective serotonin reuptake inhibitors (SSRIs). If currently receiving SSRI treatment, the dosage must be stable for at least 8 weeks prior to enrollment * With at least 9 years of education Exclusion Criteria: * Any DSM-5 diagnosis other than OCD (except OCPD) * OCD symptoms too severe to complete assessments * Received electroconvulsive therapy (ECT) within the past 6 months * Received other forms of neuromodulation within the past 2 months（see Item 3 for ECT） * Severe medical illness or seizure risk (e.g., cardiovascular, respiratory conditions) * Neurological disorders or history of brain injury/surgery * MRI-incompatible implants (e.g., pacemaker, stents, cochlear implants). * Current suicidal risk per investigator judgment * Pregnant or planning pregnancy during the study * Started structured OCD psychotherapy within 3 months, with expected change during treatment