Predicting Hypnotic Susceptibility by a Self-Report Phenomenological State Instrument

In an attempt to predict hypnotic susceptibility (as measured by the Harvard Group Scale of Hypnotic Susceptibility, HGSHS), the phenomenological experiences of an hypnotic induction (HI) procedure and a baseline comparison condition (eyes closed, EC, sitting quietly) were assessed. After each experience the subjects (n = 217) completed the Phenomenology of Consciousness Inventory (PCI), a self-report phenomenological state instrument, dealing with that condition. Step-wise multiple regression and discriminant analyses were then performed on the data using the subject's HGSHS score as the dependent variable and the PCI (sub)dimensions as the independent variables. Regression analyses that held up under cross-validation during HI suggest that the PCI may be an appropriate instrument for predicting susceptibility. The possible clinical usefulness of this approach is discussed.