Illusion that the eye-roll sign is related to hypnotizability.
In Spiegel's Hypnotic Induction Profile (HIP), a scale for measuring hypnotic responsiveness, the claim has been made that the eye-role sign (ER) can predict hypnotizability usable in clinical practice with a success rate of 75%. Using data from thousands of clinical cases, the ER correlated .22 with other items within the HIP--not high enough for predictive purposes. The present analysis shows how clinical observations uncorrected by statistical analysis can lead to illusory interpretations.
D005123:Eye; D006801:Humans; D006990:Hypnosis; D010551:Personality; D011581:Psychological Tests / Q000592:standards*; D013223:Statistics as Topic; D013404:Suggestion