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.