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Abstract
The pupil size of a single S was recorded under 2 types of hypnotic suggestion: alertness instructions and traditional relaxation instructions. It was found that the size of the pupil increased significantly under alertness instructions. This result was taken as further corroboration of the hypothesis that changes in various parameters of arousal apparently associated with hypnosis may be attributed to specifiable characteristics of the instructions used rather than to stable characteristics of the “state” of hypnosis.