The Development of a Japanese Version of the State Cognitive Fusion Questionnaire

This series of studies developed the Japanese version of the State Cognitive Fusion Questionnaire (SCFQ‐J) and examined its psychometric properties. In Study 1, 411 participants completed the questionnaire. Confirmatory factor analyses supported a one‐factor model for the SCFQ‐J. In Study 2, to examine the responsiveness of the SCFQ‐J to a brief defusion exercise, 40 Japanese participants were randomly assigned to either a cognitive defusion or control condition. The SCFQ‐J showed superior responsiveness to a brief defusion exercise than a commonly used measure (thought believability). In Study 3, to examine whether the SCFQ‐J was more sensitive to dissociated movements than the original Cognitive Fusion Questionnaire (CFQ‐J), 40 Japanese participants were randomly assigned to either an SCFQ‐J or CFQ‐J condition. The SCFQ‐J showed better sensitivity than the CFQ‐J to a brief defusion exercise, supporting its suitability for experimental studies. Our findings suggest that the SCFQ‐J is a valuable measure of state cognitive fusion in Japan.