The Eye Roll Sign and other Scores of the Hypnotic Induction Profile (HIP) as Related to the Stanford Hypnotic Susceptibility Scale, Form C (SHSS:C): A Critical Discussion of a Study by Frischholz and Others

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Abstract
A replication of a study of the relationship between the Hypnotic Induction Profile (HIP) and the Stanford Hypnotic Susceptibility Scale, Form C (SHSS:C) found a slightly higher correlation between the scales with a sample of students at Fordham University than the previous study had found at the University of Pennsylvania and at Stanford University. This is not the point at issue because the found correlation can be interpreted as within the range of expected correlations with samples of limited size. At issue, however, are other features of the report which continues to offer as findings misleading interpretations of the value of the Eye Roll sign, based on faulty logic. The Eye Roll was formerly believed to predict demonstrable hypnotizability, but after it was learned that within the HIP there was a very low correlation between the Eye Roll and the Induction score, the Eye Roll was “saved” by interpreting it as a sign of “hypnotic potential” or “nonusable hypnotizability.” This interpretation lacks substance because the Eye Roll grades are not used at all in the new scoring system to make the distinction between Nonintact profile configurations (said to indicate “nonusable hypnotizability”) and the remaining Intact profile configurations. The distinction is made instead solely on the basis of arm levitation and the control differential, closely related to it. Logical analysis leads to the conclusion that arm levitation is the only part of the HIP which as ordinarily used, measures or predicts hypnotizability.

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