Background: Problem-solving ability is influenced by numerous cognitive factors. However, a significant research gap exists regarding the mediating role of cognitive defusion in the relationship between autobiographical memory (AM) and metacognitive awareness with problem-solving. Given the critical role of problem-solving, this study aimed to model the relationship between AM and metacognitive awareness with problem-solving, considering the mediating role of cognitive defusion in individuals with borderline personality disorder (BPD). Method: The study population comprised all individuals with BPD referred to counseling centers and psychiatric clinics in Kurdistan province. A sample of 300 individuals diagnosed with BPD according to the DSM-V and willing to participate was selected. All data were collected using self-report questionnaires. Results: Path analysis results indicated that AM and metacognitive awareness had a significant positive direct effect on both problem-solving and cognitive defusion. Additionally, cognitive defusion significantly mediated the relationships between AM and metacognitive awareness with problem-solving. Conclusions: These findings provide evidence for the significant roles of AM and metacognitive awareness in problem-solving, with cognitive defusion acting as a crucial mediating factor in individuals with BPD. these results offer valuable insights for both theoretical understanding and clinical interventions, which could enhance problem-solving skills in individuals with BPD by strengthening cognitive defusion.
