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Abstract
The stability of the phenomenon reported by Nace and Orne (1970), the tendency to complete an uncompleted posthypnotic suggestion, was further investigated. Two experiments were designed to examine it under different conditions and to test the generalizability of the hypotheses suggested by their findings. The present results indicated (a) that waking suggestions are equally as effective as posthypnotic suggestions in creating a tendency to complete an uncompleted response, (b) no clear relationship was found between hypnotic susceptibility and the tendency to complete an uncompleted posthypnotic suggestion, and (c) there was the suggestion that demand characteristics of the experimental setting may in part account for the tendency to complete a posthypnotic suggestion. In sum, the results question the stability of the relationships between the phenomenon and other hypnotic variables that were reported by Nace and Orne.