Every 2 weeks, participants will undergo assessments of treatment effectiveness and side effects. After 2, 4, 6, 9, and 12 months, participants will undergo various neuropsychological tests and clinical interviews and self-report questionnaires about mood and life experiences. At study entry and at Weeks 12 and 24, participants will use a handheld computer to complete a week-long assessment of emotions. Fully healthy female participants will be asked to complete a functional magnetic resonance imaging (fMRI) scan, which will assess their ability to regulate emotions at the neural level. The fMRI scan and a stress test (for both men and women) will be performed at baseline and after 6 months.