Abstract Problems with positive emotion are an important component of posttraumatic stress disorder (PTSD), with competing perspectives as to why. The global model suggests that people with PTSD experience a relatively permanent shift in their capacity for positive emotion regardless of context, whereas the context‐specific model posits access to the full repertoire of positive emotion that only becomes reduced during exposure to trauma reminders. We tested the global versus context‐specific models using ecological momentary assessment (EMA). Trauma‐exposed adult community members (N = 80) with (n = 39) and without diagnosed PTSD completed 3 days of EMA (n = 2,158 observations). Participants with PTSD reported lower average momentary levels of positive emotion, B = ?0.947, 95 CI ?1.35, ?0.54, p < .001, and positive situations, B = ?0.607, 95 CI ?1.16, ?0.05, p = .032, and more thinking about trauma reminders, B = 0.360, 95 CI 0.21, 0.51, p < .001. There was no between‐group difference in positive emotion reactivity (degree of positive emotion derived from positive situations), B = 0.03, 95 CI ?0.09, 0.14, p = .635. Increased thinking about trauma reminders predicted lower momentary levels of positive emotion, B = ?0.55, 95 CI ?0.83, ?0.26, p < .001, but not reactivity, B = 0.02, 95 CI ?0.35, 0.40, p = .906, irrespective of PTSD status. Findings supported the global model and were inconsistent with the context‐specific model. This study helps clarify positive emotional functioning in trauma‐exposed adults and highlights future directions to better understand problems with positive emotion in PTSD.
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