Gaudiano, B. A., & Herbert, J. D. (2006). Believability of hallucinations as a potential mediator of their frequency and associated distress in psychotic inpatients. Behavioural and Cognitive Psychotherapy, 34, 497–502.
Mediational analysis of Guadiano and Herbert, 2006. Among other findings shows that believability mediates the distress of hallucinations, controlling for hallucination frequency.