Positive affect inertia uniquely differentiates formerly depressed individuals from healthy controls: An ecological momentary assessment study.

= 56), while using ecological momentary assessment data collected 10 times per day. The samples differed with respect to indicators of negative and positive affect dynamics computed from ecological momentary assessment data. However, when jointly considering all of emotional variability, inertia, and mean affect, only emotional inertia emerged as a significant predictor of group assignment. Specifically, the higher emotional inertia of positive affect proved to be the most influential predictor of belonging to the sample of formerly depressed persons versus being a healthy control. The finding remained even after controlling for differences in depressive symptoms between the samples. These findings indicate that positive affect inertia may characterize formerly depressed persons after symptoms have subsided, potentially indicating vulnerability for recurrence of depression episodes. (PsycInfo Database Record (c) 2026 APA, all rights reserved).