Objective: The add-on intervention "metacognitive training for borderline patients (B-MCT)" targets cognitive biases in patients with borderline personality disorder (BPD). We aimed to evaluate acceptance, feasibility, and subjective use of this group intervention.
Methods: Forty-eight inpatients with BPD were randomly assigned to 8 sessions of B-MCT versus an active control intervention (progressive muscle relaxation). Subjective use was assessed after 4 weeks.
Results: B-MCT yielded significantly superior scores relative to the control group on several parameters, for example, use, fun, recommendation, and subjective improvements in symptomatology and cognitive abilities (e.g., perspective taking).
Conclusions: The trial provides preliminary evidence for the acceptance and feasibility of metacognitive training in BPD. However, randomized controlled trials with larger samples and symptomatic outcomes are needed to investigate the specific impact of B-MCT on psychopathology and cognition.
Keywords: borderline personality disorder; cognition; cognitive biases; metacognitive training.