Payame Noor University Neuropsychology 2476-5023 10 39 2025 01 20 Comparison of the Effectiveness of the Meta-thinking Training Program based on Mental-Brain Simulation and Clay Art Therapy on the emotion regulation of adolescents with Attention Deficit- Hyperactivity Disorder (ADHD): A Randomized Controlled Clinic Comparison of the Effectiveness of the Meta-thinking Training Program based on Mental-Brain Simulation and Clay Art Therapy on the emotion regulation of adolescents with Attention Deficit- Hyperactivity Disorder (ADHD): A Randomized Controlled Clinic 12129 10.30473/clpsy.2025.73558.1772 FA Abed Mahdavi PhD in Educational Psychology, University of Tehran, Tehran, Iran. 0000-0002-3494-6000 Manijeh Noori MA of Islamic Arts, University of Science and Culture, Tehran, Iran. Ladan Valizadeh Davoodabadi BA of Handicraft Art, Tehran University of Art, Tehran, Iran. Hoda Ghoraeian PhD in Educational Psychology, University of Tehran, Tehran, Iran. Zahra Ramezanpour Sobhani MA of General Psychology, Faculty of Psychology and Education Sciences, Payame Noor University, Tehran, Iran. Yaser Heidari PhD in Educational Psychology, University of Tehran, Tehran, Iran. Ebtesam Farajollahzadeh Department of Psychology, Islamic Azad University, Science and Research Branch, Tehran, Iran. Journal Article 2025 03 04 Purpose: Attention hyperactivity disorder (ADHD) is one of the most common neurodevelopmental disorders characterized by symptoms of inattention, hyperactivity, and impulsivity. The study compared the effectiveness of the Meta-thinking Training Program based on Mental-Brain Simulation (MTMBS) and Clay Art Therapy (CAT) in improving emotion regulation in adolescents with ADHD. Method: This study was a randomized controlled clinical trial of the semi-experimental type in which 45 adolescents with ADHD were randomly placed in three Test and control groups. The emotion regulation difficulty questionnaire of Graz and Romer (2004) and the Connors parenting form grading questionnaire (1978) were used to collect data. The training intervention of both methods was implemented for eight and sixteen sessions of 90 minutes. The data analysis was performed using multivariate covariance analysis and a Bonferroni test. Findings: The results indicated that both therapeutic approaches significantly improved emotion regulation in adolescents with ADHD. A multivariate covariance analysis revealed that the therapeutic interventions accounted for 80 to 83 percent of the changes in various components of emotion regulation. However, Statistical evaluation indicated no significant variance in effectiveness between the treatments. Conclusion: Based on the findings, both therapeutic approaches are equally effective in improving the emotion regulation of adolescents with ADHD. These results have important implications for providing evidence-based therapeutic interventions for this group of patients and can help improve their quality of life and mental health. Purpose: Attention hyperactivity disorder (ADHD) is one of the most common neurodevelopmental disorders characterized by symptoms of inattention, hyperactivity, and impulsivity. The study compared the effectiveness of the Meta-thinking Training Program based on Mental-Brain Simulation (MTMBS) and Clay Art Therapy (CAT) in improving emotion regulation in adolescents with ADHD. Method: This study was a randomized controlled clinical trial of the semi-experimental type in which 45 adolescents with ADHD were randomly placed in three Test and control groups. The emotion regulation difficulty questionnaire of Graz and Romer (2004) and the Connors parenting form grading questionnaire (1978) were used to collect data. The training intervention of both methods was implemented for eight and sixteen sessions of 90 minutes. The data analysis was performed using multivariate covariance analysis and a Bonferroni test. Findings: The results indicated that both therapeutic approaches significantly improved emotion regulation in adolescents with ADHD. A multivariate covariance analysis revealed that the therapeutic interventions accounted for 80 to 83 percent of the changes in various components of emotion regulation. However, Statistical evaluation indicated no significant variance in effectiveness between the treatments. Conclusion: Based on the findings, both therapeutic approaches are equally effective in improving the emotion regulation of adolescents with ADHD. These results have important implications for providing evidence-based therapeutic interventions for this group of patients and can help improve their quality of life and mental health.