Causal Role of Delta-beta Coupling for Goal-directed Behavior in Anhedonic Depression

Inclusion Criteria: * Between the ages of 18 and 65 * Able to provide informed consent * Have normal to corrected vision * Willing to comply with all study procedures and be available for the duration of the study * Speak and understand English * Mild suicide risk as determined by the Hamilton Depression Rating Scale (HAM-D; less than 3 for the suicidality item) and non-existent or mild risk according to the Depression Symptom Index Suicidality Subscale (DSI-SS). * Patient Health Questionnaire (PHQ-8) greater than or equal to 8 prior to the first session * Snaith Hamilton Pleasure Scale (SHAPS) greater than 33 at the first session * A diagnosis of major depressive disorder on the Mini International Neuropsychiatric Interview for the DSM-V (MINI) Exclusion Criteria: * ADHD (currently under treatment) * Neurological disorders and conditions including, but not limited to history of epilepsy; seizures, except childhood febrile seizures; dementia; history of stroke; Parkinson's disease, multiple sclerosis, cerebral aneurysm; brain tumors * Medical or neurological illness or treatment for a medical disorder that could interfere with study participation. For example, unstable cardiac disease, HIV/AIDS, malignancy, liver or renal impairment * Prior brain surgery * Any brain devices/implants including cochlear implants and aneurysm clips, cardiac pacemaker, or any other implanted electronic device * History of current traumatic brain injury * Pregnancy (for females) * Current sever…