Hypnosis is a mental state (state theory) or set of attitudes (non-state theory) usually induced by a procedure known as a hypnotic induction, which is commonly composed of a series of preliminary instructions and suggestions. Hypnotic suggestions may be delivered by a hypnotist in the presence of the subject, or may be self-administered ("self-suggestion" or "autosuggestion"). The use of hypnotism for therapeutic purposes is referred to as "hypnotherapy".

The words 'hypnosis' and 'hypnotism' both derive from the term "neuro-hypnotism" (nervous sleep) coined by the Scottish physician and surgeon James Braid around 1841. Braid based his practice on that developed by Franz Anton Mesmer and his followers ("Mesmerism" or "animal magnetism"), but differed in his theory as to how the procedure worked.

Although a popular misconception is that hypnosis is a form of unconsciousness resembling sleep, contemporary research suggests that it is actually a wakeful state of focused attention and heightened suggestibility, with diminished peripheral awareness. In the first book on the subject, Neurypnology (1843), Braid described "hypnotism" as a state of physical relaxation accompanied and induced by mental concentration ("abstraction").

Characteristics

Skeptics point out the difficulty distinguishing between hypnosis and the placebo effect, proposing that hypnosis is so heavily reliant upon the effects of suggestion and belief that it would be hard to imagine how a credible placebo control could ever be devised for a hypnotism study.

Some researchers and clinicians would object however that hypnotic suggestion is explicitly intended to make use of the placebo effect, e.g., Irving Kirsch has proposed a definition of hypnosis as a "non-deceptive mega-placebo", i.e., a method which openly makes use of suggestion and employs methods to amplify its effects.

Definitions

The earliest definition of hypnosis was given by Braid, who coined the term "hypnotism" as an abbreviation for "neuro-hypnotism", or nervous sleep, which he opposed to normal sleep, and defined as:

a peculiar condition of the nervous system, induced by a fixed and abstracted attention of the mental and visual eye, on one object, not of an exciting nature.

Braid elaborated upon this brief definition in a later work:

the real origin and essence of the hypnotic condition, is the induction of a habit of abstraction or mental concentration, in which, as in reverie or spontaneous abstraction, the powers of the mind are so much engrossed with a single idea or train of thought, as, for the nonce, to render the individual unconscious of, or indifferently conscious to, all other ideas, impressions, or trains of thought. The hypnotic sleep, therefore, is the very antithesis or opposite mental and physical condition to that which precedes and accompanies common sleep

Braid therefore defined hypnotism as a state of mental concentration which often led to a form of progressive relaxation termed "nervous sleep". Later, in his The Physiology of Fascination (1855), Braid conceded that his original terminology was misleading, and argued that the term "hypnotism" or "nervous sleep" should be reserved for the minority (10%) of subjects who exhibited amnesia, substituting the term "monoideism", meaning concentration upon a single idea, as a description for the more alert state experienced by the others.

A contemporary account of hypnosis, derived from academic psychology, was provided in 2005, when the Society for Psychological Hypnosis, Division 30 of the American Psychological Association (APA), published the following formal definition:

The American Psychological Association's Definition of Hypnosis
Hypnosis typically involves an introduction to the procedure during which the subject is told that suggestions for imaginative experiences will be presented. The hypnotic induction is an extended initial suggestion for using one's imagination, and may contain further elaborations of the introduction. A hypnotic procedure is used to encourage and evaluate responses to suggestions. When using hypnosis, one person (the subject) is guided by another (the hypnotist) to respond to suggestions for changes in subjective experience, alterations in perception, sensation, emotion, thought or behaviour. Persons can also learn self-hypnosis, which is the act of administering hypnotic procedures on one's own. If the subject responds to hypnotic suggestions, it is generally inferred that hypnosis has been induced. Many believe that hypnotic responses and experiences are characteristic of a hypnotic state. While some think that it is not necessary to use the word "hypnosis" as part of the hypnotic induction, others view it as essential.
Details of hypnotic procedures and suggestions will differ depending on the goals of the practitioner and the purposes of the clinical or research endeavor. Procedures traditionally involve suggestions to relax, though relaxation is not necessary for hypnosis and a wide variety of suggestions can be used including those to become more alert. Suggestions that permit the extent of hypnosis to be assessed by comparing responses to standardised scales can be used in both clinical and research settings. While the majority of individuals are responsive to at least some suggestions, scores on standardised scales range from high to negligible.

Induction

Hypnosis is normally preceded by a "hypnotic induction" technique. Traditionally this was interpreted as a method of putting the subject into a "hypnotic trance"; however subsequent "nonstate" theorists have viewed it differently, as a means of heightening client expectation, defining their role, focusing attention, etc. There are an enormous variety of different induction techniques used in hypnotism. However, by far the most influential method was the original "eye-fixation" technique of Braid, also known as "Braidism". Many variations of the eye-fixation approach exist, including the induction used in the Stanford Hypnotic Susceptibility Scale (SHSS), the most widely-used research tool in the field of hypnotism. Braid's original description of his induction is as follows:

James Braid's Original Eye-Fixation Hypnotic Induction Method
Take any bright object (I generally use my lancet case) between the thumb and fore and middle fingers of the left hand; hold it from about eight to fifteen inches from the eyes, at such position above the forehead as may be necessary to produce the greatest possible strain upon the eyes and eyelids, and enable the patient to maintain a steady fixed stare at the object.

The patient must be made to understand that he is to keep the eyes steadily fixed on the object, and the mind riveted on the idea of that one object. It will be observed, that owing to the consensual adjustment of the eyes, the pupils will be at first contracted: they will shortly begin to dilate, and after they have done so to a considerable extent, and have assumed a wavy motion, if the fore and middle fingers of the right hand, extended and a little separated, are carried from the object towards the eyes, most probably the eyelids will close involuntarily, with a vibratory motion. If this is not the case, or the patient allows the eyeballs to move, desire him to begin anew, giving him to understand that he is to allow the eyelids to close when the fingers are again carried towards the eyes, but that the eyeballs must be kept fixed, in the same position, and the mind riveted to the one idea of the object held above the eyes. It will generally be found, that the eyelids close with a vibratory motion, or become spasmodically closed.

Braid himself later acknowledged that the hypnotic induction technique was not necessary in every case and subsequent researchers have generally found that on average it contributes less than previously expected to the effect of hypnotic suggestions (q.v., Barber, Spanos & Chaves, 1974). Many variations and alternatives to the original hypnotic induction techniques were subsequently developed. However, exactly 100 years after Braid introduced the method, another expert could still state: "It can be safely stated that nine out of ten hypnotic techniques call for reclining posture, muscular relaxation, and optical fixation followed by eye closure."

Suggestion

Main article: Suggestion

When James Braid first described hypnotism, he did not use the term "suggestion" but referred instead to the act of focusing the conscious mind of the subject upon a single dominant idea. Braid's main therapeutic strategy involved stimulating or reducing physiological functioning in different regions of the body. In his later works, however, Braid placed increasing emphasis upon the use of a variety of different verbal and non-verbal forms of suggestion, including the use of "waking suggestion" and self-hypnosis. Subsequently, Hippolyte Bernheim shifted the emphasis from the physical state of hypnosis on to the psychological process of verbal suggestion.

I define hypnotism as the induction of a peculiar psychical condition which increases the susceptibility to suggestion. Often, it is true, the sleep that may be induced facilitates suggestion, but it is not the necessary preliminary. It is suggestion that rules hypnotism. (Hypnosis & Suggestion, 1884: 15)

Bernheim's conception of the primacy of verbal suggestion in hypnotism dominated the subject throughout the twent

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