Tendency to repeatedly & passively rehash on one’s emotional state, cause & implications; closely linked to depression maintenance & prediction.
Pasyugina, I., Koval, P., De Leersnyder, D., Mesquita, B. & Kuppens, P. (2015). Distinguishing between level and impact of rumination as predictors of depressive symptoms: an experience sampling study. Cognition & Emotion, 29 (4). 736.746.