Students complete the Melancholic subscale of the Four Temperaments Test (O4TS) and the Zung Self-Rating Depression Scale, then pool paired scores from 9 classmates to calculate a Pearson r. The lab examines whether the ancient Melancholic type — characterized by analytical thinking, sensitivity, and proneness to negative emotion — predicts more depressive symptoms on a validated clinical scale. Students explain the psychological mechanism linking melancholic traits (rumination tendency, pessimi