Rumination in response to negative affect has been found to predict the onset, severity, and duration of depressive symptoms. Few researchers, however, have considered rumination within bipolar disorder, nor have studies considered parallel responses that might intensify positive affect. The current study examined self-reported rumination in response to both negative and positive affect among people diagnosed via the SCID with BPD (n = 28), major depressive disorder (MDD; n = 35), or no mood disorder (n = 44). Participants completed the Ruminative Response Scale and the Responses to Positive Affect Questionnaire about their dispositional tendencies. Results indicated that compared to control participants, people with BPD and MDD endorsed heightened rumination in response to negative affect, but only those with BPD endorsed elevated rumination in response to positive affect. Within BPD, ruminative responses to negative affect were explained by depressive symptoms. Goals for understanding responses to negative and positive affect in BPD are suggested.
