Distinct modes of ruminative self-focus: Impact of abstract versus concrete rumination on problem solving in depression.

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Abstract
One account for the negative effects of rumination on social problem solving (SPS) is the symptom-focus hypothesis, which proposes that focus on symptoms amplifies the vicious cycle between depressed mood and negative cognition. The authors tested a contrasting account, the reduced concreteness hypothesis, which postulates that the abstract thinking typical of rumination impairs SPS. In 40 depressed patients and 40 never-depressed controls, SPS was assessed before and after versions of symptom-focused rumination known to differentially induce abstract versus concrete self-focus (E. Watkins & J. D. Teasdale, 2001). As predicted by reduced concreteness theory, relative to abstract self-focus, concrete self-focus improved SPS in depressed patients, suggesting that the particular mode of symptom-focus, rather than symptom-focus per se, determines the effects of rumination on problem solving.