Beyond Positive Affect: Discrete Positive Emotions Differentiate Major Depression from Social Anxiety Disorder

Background Social anxiety disorder (SAD) and major depressive disorder (MDD) are both associated with diminished global positive affect. However, little is known about which specific positive emotions are affected, and which positive emotions differentiate MDD from SAD. Methods Four groups of adults recruited from the community were examined ( N = 272): control group (no psychiatric history; n = 76), SAD without MDD group ( n = 76), MDD without SAD group ( n = 46), and comorbid group (diagnoses of both SAD and MDD; n = 74). Discrete positive emotions were measured with the Modified Differential Emotions Scale, which asked about the frequency of 10 different positive emotions experienced during the past week. Results The control group had higher scores on all positive emotions compared to all three clinical groups. The SAD group had higher scores on awe, inspiration, interest, and joy compared to the MDD group, and higher scores on those emotions, as well as amusement, hope, love, pride, and contentment, than the comorbid group. MDD and comorbid groups did not differ on any positive emotions. Gratitude did not differ significantly between clinical groups. Conclusion Adopting a discrete positive emotion approach revealed shared and distinct features across SAD, MDD, and their comorbidity. We consider possible mechanisms underlying transdiagnostic vs. disorder-specific emotion deficits.