{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,21]],"date-time":"2026-01-21T21:09:04Z","timestamp":1769029744387,"version":"3.49.0"},"reference-count":49,"publisher":"Korean Neuropsychiatric Association","issue":"1","license":[{"start":{"date-parts":[[2026,1,2]],"date-time":"2026-01-02T00:00:00Z","timestamp":1767312000000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc\/4.0\/"}],"content-domain":{"domain":["psychiatryinvestigation.org"],"crossmark-restriction":true},"short-container-title":["Psychiatry Investig"],"published-print":{"date-parts":[[2026,1,25]]},"abstract":"<jats:p>Objective Both acceptance and commitment therapy (ACT) and metacognitive therapy (MCT) for obsessive-compulsive disorder (OCD) target metacognition. In this context, ACT\u2019s therapeutic effects on OCD are presumably reflected in the Obsessive Belief Questionnaire (OBQ), which incorporates significant metacognitive factors. However, most studies have investigated ACT\u2019s effects on OCD symptoms rather than on obsessive beliefs.Methods This study examined the relationship between ACT process measures\u2014Acceptance and Action Questionnaire-II (AAQ-II) and Cognitive Fusion Questionnaire (CFQ)\u2014and the OBQ following an 8-week group-format ACT (GACT) intervention among patients with OCD (GACT group, n=37; wait-list control group, n=42).Results Significant reductions were observed in AAQ-II, CFQ, and OBQ scores after treatment. Changes in AAQ-II and CFQ (particularly in the former) were significantly associated with changes in the OBQ total and subscale scores. These measures accounted for 26% and 12% of the variance in the OBQ total score and OCD symptom scores, respectively. Among OBQ subscales, changes in AAQ-II and CFQ best accounted for the variance of perfectionism and intolerance of uncertainty (OBQ-PU), followed by importance and control of thoughts (OBQ-ICT).Conclusion Improvements in ACT process measures through GACT were more strongly linked to obsessive beliefs than to OCD symptoms, highlighting the role of obsessive beliefs\u2014particularly OBQ-PU and OBQ-ICT\u2014in ACT\u2019s effectiveness for OCD.<\/jats:p>","DOI":"10.30773\/pi.2025.0265","type":"journal-article","created":{"date-parts":[[2026,1,2]],"date-time":"2026-01-02T02:28:55Z","timestamp":1767320935000},"page":"154-163","update-policy":"https:\/\/doi.org\/10.30773\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Effectiveness of Acceptance and Commitment Therapy on Obsessive Beliefs Among Patients With Obsessive-Compulsive 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