Prevention of Seasonal Affective Disorder

Inclusion Criteria: (Patient must meet these criteria in order to be eligible for this study.) * Patient has a history of Major Depressive Disorder (MDD) with a seasonal pattern. Exclusion Criteria: (Patient cannot meet these criteria in order to be eligible for this study.) * Patient has a current or past history of seizure disorder or brain injury. * Patient has a history or current diagnosis of anorexia nervousa or bulimia. * Patient has recurrent summer depression more frequently than winter depression. * Patient has primary diagnosis of panic disorder, Obsessive Compulsive Disorder (OCD), Posttraumatic Stress Disorder (PTSD), acute distress disorder, bipolar II disorder or other psychotic disorders. * Patient has initiated psychotherapy within the last 3 months.