Efficacy of Intensified Transcranial Direct Current Stimulation in Obsessive-compulsive Disorder

Inclusion Criteria: * Diagnosis of Obsessive-compulsive Disorder by a psychiatrist and DSM-5-based behavioral checklist * being 18-50 years old * providing written informed consent * If female, negative urine pregnancy test * stable medication regime especially the classical neuroleptics and all CNS-activating medications, if taken, 4-6 weeks before the experiment and during the experiment Exclusion Criteria: * smoker * pregnancy * alcohol or substance dependence * history of seizure * history of neurological disorder * history of head injury * presence of ferromagnetic objects in the body that are contraindicated for brain stimulation of the head (pacemakers or other implanted electrical devices, brain stimulators, some types of dental implants, aneurysm clips, metallic prostheses, permanent eyeliner, implanted delivery pump, or shrapnel fragments) or fear of enclosed spaces.