Quantifying tACS-driven Improvement of Working Memory in Depression

Inclusion Criteria: * Age between 18 and 60 years old. * Stated willingness to participate and comply with all study procedures. * Stated availability for the duration of the study. * Meet criteria for Major Depressive Disorder. * Agreement to adhere to lifestyle considerations throughout study duration. * No conflict of interest with the Department of Biomedical Engineering at the University of Minnesota. * Confident level of English language. Exclusion Criteria: * History or evidence of chronic neurological disorder (e.g., history of seizures, epilepsy, unexplained episodes of loss of consciousness, serious brain injury, severe or frequent headaches) * Metal or electric implant in the head, neck or chest area. * Implanted pacemakers or other electrically, magnetically, ir mechanically activated implant * Vascular clips or other electrically sensitive support systems in the brain * Serious health conditions (e.g., congestive heart failure pulmonary obstructive chronic disease, active neoplasia) * History of head injuries. * Pregnancy or breast-feeding. * Significant damage of skin at sites of stimulation or other skin concerns, such as dermatitis, psoriasis, or eczema * Alcohol or drug addiction. * Any legal reason why the candidate cannot participate. * Concurrent enrollment in another scientific or clinical study. * Estimated IQ is below 70, defined by the WTAR. * Active suicidality or other non-controlled neuropsychiatric illness. Active suicidality will be excluded based on a C-SSRS score of 3 or above in the last 6 months. Severe depression is defined as a PHQ-9 score above 20, which will also be excluded. * A lifetime suicide attempt.