فصلنامه روانشناسی شناختی

The present study aimed to compare the effectiveness of Schema Therapy and Transdiagnostic Treatment on cognitive emotion regulation among adolescent boys with Obsessive-Compulsive Disorder (OCD). This study employed a quasi-experimental design with a pretest–posttest, control group, and three-month follow-up. The statistical population consisted of 14- to 16-year-old adolescent boys diagnosed with OCD who were referred to psychological counseling centers and clinics (Rasta and Bavar) in Sari, Iran, during 2024–2025. From this population, 45 participants were selected using purposive sampling and were randomly assigned to three groups of 15 participants each. Data were collected using the Cognitive Emotion Regulation Questionnaire (CERQ) developed by Garnefski et al. (2006) and the Yale–Brown Obsessive-Compulsive Scale (Y-BOCS) developed by Goodman et al. (1989). The first experimental group received Young’s Schema Therapy protocol (2006), whereas the second experimental group underwent Barlow et al.’s Unified Transdiagnostic Treatment protocol (2011). Data were analyzed using repeated-measures analysis of variance (RM-ANOVA). The findings indicated a significant difference between the Schema Therapy and Transdiagnostic Treatment groups in cognitive emotion regulation scores (p < .05), with Schema Therapy producing greater improvements in cognitive emotion regulation. Furthermore, the absence of significant differences between the posttest and follow-up assessments demonstrated the stability and maintenance of the treatment effects over time. Overall, the findings suggest that although both therapeutic approaches are effective in improving the psychological functioning of adolescent boys with OCD, Schema Therapy yields substantially greater improvements in cognitive emotion regulation than Transdiagnostic Treatment.