The phenomena occurring during hypnosis session usually vary in degree and variety with every subject, depending, of course, upon the innate endowments of the person being hypnotized.
Hypnosis is a result of cooperation. Without full cooperation between the subject and hypnotist there can be no successful hypnosis. Resistance to hypnosis, admitted or concealed, conveys the failure of the essential cooperation and consequently a trance state cannot take place.

As the subject plunges into a mild [tag-tec]hypnotic[/tag-tec] sleep, his consciousness narrows and external stimuli lose their significance, except those given by the hypnotist. Ultimately the subject loses contact with the external world except for the operator. Additionally, the [tag-tec]consciousness[/tag-tec] is in a state of sleep, while the [tag-tec]subconsciousness[/tag-tec] is left in rapport with the [tag-tec]hypnotist[/tag-tec]. This rapport may be defined as a state of harmony between the subject and hypnotist, with a dependence of the former upon the latter for motivating and guiding stimuli. It equips the hypnotist with the ability to remain in full contact with the subject, while the hypnotized person remains an unresponsive object to the rest of the world .

Another phenomenon is the marked [tag-tec]suggestibility[/tag-tec] occurring in the trance state. Any suggestion not objectionable to the subject will be accepted and acted upon.

Posthypnotic suggestion is the fifth feature of the trance. Subjects under [tag-tec]hypnosis[/tag-tec] may be given a suggestion to be performed or acted upon at a designated time after awakening. They respond in the designated fashion with no realization of why they do so. In this phenomenon lies the greatest clinical advantage of hypnosis, since thereby the subjects can be given suggestions during [tag-tec]hypnosis session[/tag-tec] to guide their later conduct.