Although many people retrospectively report feeling more open-minded after experiencing highly stressful events, relevant longitudinal studies are scarce and have yielded contradictory findings. The present study used a 12-month longitudinal case-control design to test whether growth in openness (assessed every 4 months using multiple methods) occurs following major stressors, and whether changes relate to clinical symptoms of depression and/or posttraumatic stress. To do so, we compared participants (a) with a recent major stressor and with low symptoms ( n = 66), (b) without a recent major stressor and with low symptoms ( n = 76), and (c) with a recent major stressor and with significant symptoms ( n = 76). Overall, growth curve models showed that group membership was not associated with changes in openness over 12 months for most outcomes. Other variables (e.g., education) predicted changes in openness. This study provides robust evidence that openness to experience is mostly stable following major stressors.

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