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Based on typical everyday trust situations, a short and ecologically valid self-report instrument for the assessment of interpersonal trust was developed (Interpersonal Trust Scenario Questionnaire [ITSQ]). Data from 1,359 clinical and nonclinical participants were analyzed to examine psychometric properties and group differences. The authors assessed interpersonal trust in patients with borderline personality disorder (BPD), patients with major depressive disorder, and patients with social anxiety disorder. Lastly, the relationship between interpersonal trust and the perceived quality of the therapeutic alliance was examined. The ITSQ showed satisfactory reliability (Cronbach's α = 0.72). Convergent validity and discriminant validity were obtained for correlations with a hypothetical trust game, another interpersonal trust scale (KUSIV-3), risk propensity, optimism and pessimism, and the HEXACO-60. Patients with BPD showed the lowest interpersonal trust scores of all groups. Interpersonal trust and the perceived quality of the therapeutic alliance were significantly associated only in the group of patients with BPD.

Background: Establishing and maintaining interpersonal trust is often difficult for patients with Borderline Personality Disorder (BPD). How we trust is influenced by prior trust experiences. Methods: For the investigation of trust experiences, autobiographical memories of n = 36 patients with BPD and n = 99 non-clinical controls were examined. Trust objects and interaction partners, emotional valence, perceived relevance and memory specificity were analyzed. Results: Content analyses revealed that patients with BPD recalled mostly situations in which their trust was failed by family members or romantic partners. In addition, patients with BPD considered memories with trust and mistrust more relevant for their current lives than the control group. Our results correspond with findings that BPD patients have difficulties trusting close others as well as with theoretical assumptions about deficits in mentalizing and epistemic trust in patients with BPD. Conclusion: In conclusion, our findings should encourage clinical practitioners to address trust deficits towards close others, as well as omniscient negative memory retrieval and interpretation biases which might influence current trust behavior.

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