• In Spiegel’s Hypnotic Induction Profile (HIP), a scale for measuring hypnotic responsiveness, the claim has been made that the eye-roll 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.
Hilgard ER. Illusion That the Eye-Roll Sign Is Related to Hypnotizability. Arch Gen Psychiatry. 1982;39(8):963-966. doi:10.1001/archpsyc.1982.04290080069010