ABSTRACT Previous studies report low self-concept clarity in depression, but they are limited to nonclinical samples and self-report questionnaires. To comprehensively understand the relationship between self-concept clarity and depression, this study expanded the range of depression to include clinical samples and explored self-concept clarity through a behavioral task. In Study 1, the self-concept clarity scale was administered to 48 nonclinical and 53 clinical participants, and the quadratic model best explained the relationship. In Study 2, 24 undergraduates and 21 depressed patients completed the me/not-me task. Shorter reaction time and greater internal consistency of negative self-descriptive words were associated with higher depression severity. The results suggest that a certain and consistent negative self-view relates to more severe depression.
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