Hypnotically-Induced “Anosmia” to Ammonia

Abstract
The procedure to demonstrate anosmia by the inhalation of ammonia is discussed. Deeply hypnotized Ss who are not knowledgeable of the relevant facts of physiology may fail to respond to ammonia fumes when it is suggested that they have no sense of smell (anosmia). However, persons who, in fact, are anosmic do respond to ammonia fumes because they are a powerful stimulus to the pain fibers in the nasal mucosa. This procedure illustrates that the crucial factor in the response of the hypnotized S is not the actual facts of anatomy and physiology, but the S's concept of them.

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