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The main thesis of this book is that hypnosis is an intensification of emotional experience, of which two types are postulated: the "disturbing" (ergotropic) and the "Stabilizing" or "tranquillizing" (trophotropic) type. The first is induced by "disturbing," the second by "stabilizing" induction methods or every day stimulus situations. Emotional intensity is equated with hypnotic depth. Four phases of emotional intensity along the ergotropic (sympathetic) and the trophotropic (parasympathetic) axis are specified, along with three phases of hypnotic depth the third corresponding to the "maximum . . .that may be reached by disturbing or stabilizing emotion, tending . . . to paralyze vital activity."
In support of his thesis, the author draws on a great great variety of neurophysiological, psychological, sociological, and anthropological studies and speculations from which he extracts what is in accord with his views. His acquaintance with pertinent literature ranges from well known as well
Gruenewald D. Hypnosis.. Arch Gen Psychiatry. 1968;19(4):510. doi:10.1001/archpsyc.1968.01740100126022