Hypnosis and Pre-sleep Patterns
I should like to consider one particular neurophysiological aspect of hypnosis—that of electroencephalography. The basic question is to ascertain whether there exists some relation between hypnosis and sleep, or pre-sleep patterns. The great majority of investigations on sleep have so far been focussed essentially on the study of two phases of sleep: that associated with slow EEG activity, on one hand; and that with fast EEG activity, or stage 1-REM sleep, on the other. Very few investigators, however, have directed their attention to the EEG patterns in drowsiness, and it is this particular aspect that I propose to discuss here. Almost all authors are agreed that, amongst the phases of sleep, it is possible to distinguish: stage 1 (known in America as “1—non-REM”), which is a stage of light sleep; the stages of slow wave sleep, which would include stages 2, 3 and 4; and finally, the stage of dreaming sleep, which is called “1-REM” in the USA, and “PMO” (phase of ocular motion) in France. These, then, are the constituent parts of sleep: drowsiness, slow wave sleep, and dreaming sleep.
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