Postmarketing Clinical Trial of tDCS to Evaluate Cognitive Ability in Depression Patients

Inclusion Criteria: 1. Diagnosis of major depressive disorder 2. CGI severity (severity of Illness) score of 3 or higher 3. Patients receiving medication for depression at the time of study participation 4. Those who can read and understand the subject's explanation and consent form and who can respond to questionnaires Exclusion Criteria: 1. History of clinically significant medical neurological disease or history of head injury 2. In case of mental retardation or cognitive impairment enough to affect the writing of consent form or conducting research 3. Severe suicidal risk or psychotic symptoms determined by the clinician 4. In the case of a contraindication to the implementation of tDCS (when a metallic auxiliary tool is inserted in the head) 5. Those who are judged to have problems with the attachment of EEG and DC stimulation electrodes due to deformities, inflammatory reactions, or other dermatological problems at the electrode attachment site 6. Among female subjects who are likely to become pregnant, those who do not agree to contraception by a medically acceptable method for up to 24 weeks after application of the investigational medical device in this clinical trial 7. Pregnant women 8. Any other person who has reasons to judge that the investigator is unsuitable for participation in the clinical trial