A Comparative Study of the Effectiveness of Cognitive Behavioral Therapy and Acceptance and Commitment Therapy on Referential Thoughts, Cognitive Flexibility, and Distress Tolerance in Patients with Major Depressive Disorder
Keywords:
Cognitive behavioral therapy, Argumentative thoughts, cognitive flexibility, Distress tolerance, major depressive disorderAbstract
Objective: This study aimed to compare the effectiveness of Cognitive Behavioral Therapy (CBT) and Acceptance and Commitment Therapy (ACT) on referential thoughts, cognitive flexibility, and distress tolerance in patients with Major Depressive Disorder (MDD).
Methodology: The research employed a quasi-experimental pretest-posttest design with a control group. The statistical population consisted of patients with MDD referred to psychological clinics in Tehran in 2025. A total of 45 participants were selected using a convenience sampling method and randomly assigned to three groups of 15: CBT, ACT, and control. Data were collected using the Perseverative Thinking Questionnaire (Ehring et al.), the Cognitive Flexibility Inventory (Dennis & Vander Wal, 2010), and the Distress Tolerance Scale (Simons & Gaher, 2005). The CBT protocol was based on Wilhelm and Steketee (2006), and the ACT intervention followed Dahl et al. (2014), each conducted in eight sessions. Data were analyzed using multivariate analysis of covariance (MANCOVA) via SPSS version 24.
Findings: The results revealed significant differences among the three groups in referential thoughts, cognitive flexibility, and distress tolerance (p<0.05). Both CBT and ACT interventions significantly reduced referential thoughts and enhanced cognitive flexibility and distress tolerance compared to the control group. However, CBT demonstrated greater overall effectiveness in improving these variables than ACT.
Conclusion: Both CBT and ACT effectively improved cognitive and emotional indicators among patients with MDD. These therapeutic approaches, by restructuring maladaptive thoughts and enhancing psychological acceptance, can promote cognitive flexibility and distress tolerance. Hence, cognitive-behavioral therapy, in particular, is recommended as an effective psychological intervention for individuals suffering from major depressive disorder.
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Copyright (c) 2025 Mahsa Allahmoradi (Translator); Mina Yaghoobi, Fatemeh Ebrahimi, Kamran Pourmohammad Ghouchani, Zahra Norouziani (Author)

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