Cognitive vulnerability is a potent risk factor for depression. Individual differences in cognitive vulnerability solidify in early adolescence and remain stable throughout the life span. However, stability does not mean immutability. We hypothesized that cognitive vulnerability would be susceptible to change during major life transitions when social milieus undergo significant changes (e.g., moving to college). Specifically, we tested the hypothesis that cognitive vulnerability could change via a contagion effect. We tested this hypothesis using a prospective longitudinal design with a sample of randomly assigned college freshmen roommate pairs (103 pairs). Results supported the hypotheses. Participants who were randomly assigned to a roommate with high levels of cognitive vulnerability were likely to “catch” their roommate’s cognitive style and develop higher levels of cognitive vulnerability. Moreover, those who experienced an increase in cognitive vulnerability had significantly greater levels of depressive symptoms over the prospective interval than those who did not.

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