Brain Changes During Social Reward Psychotherapy for Mid- and Late-Life Suicidality

Inclusion Criteria:

* Ages aged 50-80 \[stratified so that 50% are older than 65\]
* Endorsement of Suicidal Ideation \[Structured Clinical Interview for the Diagnostic and Statistical Manual for Mental Disorders-5 (SCID-5) Suicide Item (Item 9) with a score of 2
* Major Depressive Disorder as determined by the SCID-5
* Depression Rating Scale \[Montgomery-Åsberg Depression Rating Scale (MADRS)\] score of 16 or greater.
* Mini Mental Status Exam (MMSE) equal or greater than a score of 23
* Off antidepressants or on a stable dose of an antidepressant for 8 weeks and do not intend to change the dose in the next 10 weeks, without individual psychotherapy services during the study period.
* Capacity to provide consent for research assessment and treatment.

Exclusion Criteria:

* Intent or plan to attempt suicide in the near future.
* History or presence of psychiatric diagnoses other than major depressive disorder without psychotic features, generalized anxiety disorder, or specific phobia.
* Use of psychotropic drugs or cholinesterase inhibitors other than use of 0.5 mg or less of lorazepam daily up to seven times per week.
* Neurological disorders (dementias, amnestic and multidomain Mild Cognitive Impairment, Parkinson's disease, epilepsy, etc.).
* Acute or severe medical illness in the past 3 months (metastatic cancer, multiple sclerosis, decompensated cardiac, liver or kidney failure, major surgery, stroke or myocardial infarction, cardiac, renal, or respiratory failure; severe chronic obstructive pulmonary disease, etc.) that may be the primary cause depressive symptoms, influence brain systems of interest, or impact ability to participate in the study.
* Contraindications to MRI scanning including cardiac pacemaker, heart valve replacement, vascular stent, insulin pump, cochlear implant, any other metallic biomedical implant contraindicating to MRI, and claustrophobia.