His release from the posthypnotic suggestion had made it possible.
A special code phrase in the message had released "Stanley Martin" from the posthypnotic suggestion that had held him for so long.
Unless an elaborate set of posthypnotic suggestions are worked out, it is an impossible test for self-hypnosis.
Using this technique, with each subject carrying out a posthypnotic suggestion, intensifies the responses of other subjects.
That apparitions of a sort can be induced by hypnotic and posthypnotic suggestion is certain enough (see Hypnotism).
posthypnotic post·hyp·not·ic (pōst'hĭp-nŏt'ĭk)