Public Library of Science, PLoS ONE, 6(10), p. e0128095, 2015
DOI: 10.1371/journal.pone.0128095
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Objectives: Positive affect (PA) plays a crucial role in the development, course, and recovery of depression. Recently, we showed that a therapeutic application of the experience sampling method (ESM), consisting of feedback focusing on PA in daily life, was associated with a decrease in depressive symptoms. The present study investigated whether the experience of PA increased during the course of this intervention. Design: Multicentre parallel randomized controlled trial. An electronic random sequence generator was used to allocate treatments. Settings: University, two local mental health care institutions, one local hospital. Participants: 102 pharmacologically treated outpatients with a DSM-IV diagnosis of major depressive disorder, randomized over three treatment arms. Intervention: Six weeks of ESM self-monitoring combined with weekly PA-focused feedback sessions (experimental group); six weeks of ESM self-monitoring combined with six weekly sessions without feedback (pseudo-experimental group); or treatment as usual (control group).