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a rather stereotyped concept, differing little from original one, and offering a limited definition of the dissociative mechanises and their role in normal and abaomal psychological functions, The literaturo concerning oliaical entities ordinarily considered to constitute the dissociative reactions ie fairly ; w°ll limited to e ase- studies of patients with fugub.es, amnesias, soan&mbulisne, and i multiple personalities, . Unpublished studies by the writer have led hia to a greatly expanded concept Of dissociation, Dissooiative phencuaena are found in ©vsryday life. Such mcni- fo station s include "highly hypnosis"/ states of "fascination" in flyers, hypr.a- ^ ©>gio and phantasy hallucinations, transient anesthosiaa, end many other obcajsplos. These reactious have many features in oomon uith a variety of clinical disorders .including "sleep paralysis", trance states, Oilles do la Tourette«e disease, latah, "Arctic hysteria", and a number of other disturbances in addition to tlvo v/oIl.Jaom . dissociative reactions of the text-books, x \ ? • ' ' . \ ' ' • ' ' There ie considerable experimental ovidenoe pointing to the eigalficont role played by dissociative meohaftisas in the production of the various phenomena of hypnosis. In faot, hypnosis may bo cons iderod to be a pure-culture, laboratory- / - controlled dissociative reaction. Of the entire phenomenology of the various states desoribed above, there is not on® einglo manifestation which cwmofc be produced experimentally in the hypnotic subject, Thus, through tha use of hypnoslo m a laboratory devioe, the dissociative weohanisas can be studied with a high dogree of objeofcivity* Of increasing interest at tho present time are the notions of a variety of near dru-s which alter tho state of psychological - functioning. Some of those agents produce disturbances of pwooption and integration (mosoaline, lysergic aoid, oto,), . » Others produco alterations of aufcoaowio reactivity through inhibition of central (hypothalamic? ) Amotions, so that "emotional rasponsivenoss" is dlninishod (reserplne, ohlorproisa zine, etc,), Tho effuota of thc» a a(,3nt3 upon the production, ^aintonsno®, and mcalfgatatlons of diosoc.iatod states ha-o'nover v«c»n iitudiod.