Abstract
Although some investigators have previously reported light or deep sleep EEG patterns during hypnosis, most of them have not demonstrated any significant EEG differences between the hypnotic and the awake states. By quantitative electroencephalographic (EEG) methods, using digital computer period analysis and analog frequency analyzer techniques, our study demonstrated statistically (ANOV and t test) significant EEG changes during both hypnotic induction and hypnotic trance. These changes were far from drowsiness or sleep EEG patterns. During hypnotic induction, there was a significant decrease of slow and increase of alpha and beta waves accompanied by an increase in amplitude and decrease of amplitude variability, in the best hypnotic subjects. Both the best and the poorest hypnotic subjects exhibited similar changes during the hypnotic trance period, although the best hypnotic subjects showed greater EEG changes, in particular, significantly more alpha activity, than the poorest ones. Augmented alpha activity can also be seen during Yoga and Zen meditation as well as autogenic and alpha training, which seems to indicate that hypnosis has something in common with these states.
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