History
of hypnosis
This article is about the development
of concepts, beliefs and practices related to hypnosis
and hypnotherapy
from prehistoric to modern times.
Although often viewed as one
continuous history, the term hypnosis only gained
widespread use in the 1880s, initially amongst those influenced by the
developments in France, some twenty years after the death of James
Braid — who had adopted the term hypnotism in
1841.
Braid had adopted the term hypnotism
(which was specifically applied to denote the state of the subject,
rather than the techniques applied by the operator) to contrast his
own, unique, subject-centred, approach with those of the operator-centred
mesmerists
who preceded him.
Consequently, any use of the
expression hypnotism to denote the practices of mesmerists,
animal magnetists, inducers of artificial somnabulism, etc. before
1841 — or, in the case of hypnosis, any use to denote any
pre-1880s practices — is an entirely speculative, unsupportable, and
inappropriately prochronistic
distortion of recorded history.[1]
Early
history
Braid on
Yoga
According to his writings, Braid
began to hear reports concerning the practices of various Oriental
meditation techniques immediately after the publication of his major
book on hypnotism, Neurypnology (1843). Braid first discusses
hypnotism's historical precursors in a series of articles entitled Magic,
Mesmerism, Hypnotism, etc., Historically & Physiologically
Considered. He draws analogies between his own practice of
hypnotism and various forms of Hindu yoga meditation and other ancient
spiritual practices. Braid’s interest in meditation really developed
when he was introduced to the Dabistān-i
Mazāhib, the “School of Religions”, an ancient
Persian text describing a wide variety of Oriental religious
practices.
Last May [1843], a gentleman residing
in Edinburgh, personally unknown to me, who had long resided in India,
favoured me with a letter expressing his approbation of the views
which I had published on the nature and causes of hypnotic and
mesmeric phenomena. In corroboration of my views, he referred to what
he had previously witnessed in oriental regions, and recommended me to
look into the “Dabistan,” a book lately published, for additional
proof to the same effect. On much recommendation I immediately sent
for a copy of the “Dabistan”, in which I found many statements
corroborative of the fact, that the eastern saints are all self-hypnotisers,
adopting means essentially the same as those which I had recommended
for similar purposes.[2]
Although he disputed the religious
interpretation given to these phenomena throughout this article and
elsewhere in his writings, Braid seized upon these accounts of
Oriental meditation as proof that the effects of hypnotism could be
produced in solitude, without the presence of a magnetiser, and
therefore saw this as evidence that the real precursor of hypnotism
was to be sought in the ancient practices of meditation rather than in
the more recent theory and practice of Mesmerism. As he later wrote,
Inasmuch as patients can throw
themselves into the nervous sleep, and manifest all the usual
phenomena of Mesmerism, through their own unaided efforts, as I have
so repeatedly proved by causing them to maintain a steady fixed gaze
at any point, concentrating their whole mental energies on the idea of
the object looked at; or that the same may arise by the patient
looking at the point of his own finger, or as the Magi of Persia and
Yogi of India have practised for the last 2,400 years, for religious
purposes, throwing themselves into their ecstatic trances by each
maintaining a steady fixed gaze at the tip of his own nose; it is
obvious that there is no need for an exoteric influence to produce the
phenomena of Mesmerism. […] The great object in all these processes
is to induce a habit of abstraction or concentration of attention, in
which the subject is entirely absorbed with one idea, or train of
ideas, whilst he is unconscious of, or indifferently conscious to,
every other object, purpose, or action. [3]
Sleep
temples
Hypnotism as a tool for health seems
to have originated with the Hindus
of ancient
India who often took their sick to sleep
temples to be cured by hypnotic suggestion as also found to be the
case in ancient
Egypt and Greece.
Hypnotic-like inductions were used to place the individual in a
sleep-like state, although it is now accepted that hypnosis is
different from sleep.
Avicenna
Avicenna
(Ibn Sina) (980-1037), a Persian
psychologist and physician,
was the earliest to make a distinction between sleep and hypnosis. In The
Book of Healing, which he published in 1027, he referred to
hypnosis in Arabic
as al-Wahm al-Amil, stating that one could create conditions in
another person so that he/she accepts the reality of hypnosis.[4]
Magnetism
& Mesmerism
Hypnotism evolved out of a sometimes
skeptical reaction to the much earlier work of magnetists
and Mesmerists.
Paracelsus
Paracelsus
Paracelsus
(1493-1541), a Swiss,
was the first physician to use magnets
in his work. Many people claimed to have been healed after he had
passed magnets (lodestones)
over their bodies.
Valentine
Greatrakes
An Irishman by the name of Valentine
Greatrakes (1628-1666) was known as "the Great Irish Stroker"
for his ability to heal people by laying his hands on them and passing
magnets over their bodies.
Johann
Joseph Gassner
Johann
Joseph Gassner (1727-1779), a Catholic priest of the time,
believed that disease was caused by evil spirits and could be
exorcised by incantations and prayer.
Father
Maximilian Hell
Around 1771, a Viennese Jesuit named Maximilian
Hell (1720-1792) was using magnets to heal by applying steel
plates to the naked body. One of Father Hell's students was a young
medical doctor from Vienna named Franz Anton Mesmer.
Franz
Anton Mesmer
Mesmer
Western scientists first became
involved in hypnosis around 1770,
when Dr.
Franz Mesmer (1734-1815), a physician from Austria, started
investigating an effect he called "animal
magnetism" or "mesmerism"
(the latter name still remaining popular today).
The use of the (conventional) English
term animal magnetism to translate Mesmer's magnétisme
animal is extremely misleading for three reasons:
Mesmer chose his term to clearly
distinguish his variant of magnetic force from those which were
referred to, at that time, as mineral magnetism, cosmic
magnetism and planetary magnetism.
Mesmer felt that this particular
force/power only resided in the bodies of humans and animals.
Mesmer chose the word "animal",
for its root meaning (from latin animus = "breath")
specifically to identify his force/power as a quality that belonged to
all creatures with breath; viz., the animate beings: humans and
animals.
Mesmer developed his own theory and
inspired himself also to the writings of the English physician Richard
Mead. Mesmer found that, after opening a patient's vein and letting
the patient bleed for a while, by passing magnets over the wound would
make the bleeding stop. Mesmer also discovered that using a stick
instead would also make the bleeding stop.
After moving to Paris and becoming
popular with the French aristocracy for his magnetic cures, the
medical community challenged him. The French king put together a Board
of Inquiry that included chemist Lavoisier,
Benjamin
Franklin, and a medical doctor who was an expert in pain control
named Joseph
Ignace Guillotin. Mesmer refused to cooperate with the
investigation and this fell to his disciple Dr d'Eslon. Franklin
constructed an experiment in which a blindfolded patient was shown to
respond as much to a non-prepared tree as to one that had been "magnetised"
by d'Eslon. This is considered to be perhaps the first
placebo-controlled trial of a therapy ever conducted. The commission
later declared that Mesmerism worked by the action of the imagination.[5]
Although Mesmerism remained popular
and "magnetic therapies" are still advertised as a form of
"alternative medicine" even today, Mesmer himself retired to
Switzerland in obscurity, where he died in 1815.
Abbé
Faria
Abbé
Faria
Many of the original mesmerists were
signatories to the first declarations proclaiming the French
revolution in 1789. Far from being surprising, this was almost to be
expected, in that mesmerism had opened up the prospect that the social
order was in some sense suggested
and could be overturned. Magnetism was neglected or forgotten during
the Revolution and the Empire.
An Indo-Portuguese
priest, Abbé
Faria, revived public attention to animal magnetism. In the early
19th century, Abbé
Faria introduced oriental
hypnosis to Paris.
Faria came from India
and gave exhibitions in 1814 and 1815 without manipulations or the use
of Mesmer's baquet.
Unlike Mesmer, Faria
claimed that it 'generated from within the mind’ by the power of
expectancy and cooperation of the patient. Faria's approach was
significantly extended by the clinical and theoretical work of Hippolyte
Bernheim and Ambroise-Auguste
Liébeault of the Nancy
School. Faria's theoretical position, and the subsequent
experiences of those in the Nancy School made significant
contributions to the later autosuggestion
techniques of Émile
Coué and the autogenic
training techniques of Johannes
Heinrich Schultz.
De
Puységur
Marquis de
Puységur
A student of Mesmer, Marquis
de Puységur, first described and coined the term for "somnambulism."
Followers of Puységur called
themselves "Experimentalists" and believed in the Paracelsus-Mesmer
fluidism theory.
Récamier
and Reichenbach
Reichenbach
Récamier, in 1821, prior to the
development of hypnotism, was the first physician known to have used
something resembling hypnoanesthesia
and operated on patients under mesmeric coma.
In the 1840s
and 1850s,
Carl
Reichenbach began experiments to find any scientific validity to
"mesmeric" energy, which he termed Odic
force after the Norse god Odin.[6]
Although his conclusions were quickly rejected in the scientific
community, they did undermine Mesmer's claims of mind
control. James
Braid published an influential book attacking Reichenbach's views
as pseudoscientific entitled The Power of the Mind over the Body
(1846).[7]
James
Esdaile
Dr. James
Esdaile (1805-1859) reported on 345 major operations performed
using mesmeric sleep as the sole anesthetic
in British
India. The development of chemical anesthetics soon saw the
replacement of hypnotism in this role.
John
Elliotson
Dr. John
Elliotson (1791-1868), an English surgeon, in 1834 reported
numerous painless surgical operations that had been performed using
mesmerism.
19th
Century Hypnotism
Professor Charcot
(left) of Paris'
Salpêtrière
demonstrates hypnosis
on a "hysterical"
patient, "Blanche" (Marie) Wittman, who is supported by Dr. Joseph
Babiński.
James
Braid
James
Braid
The Scottish surgeon and physician James
Braid coined the term "hypnotism"
in his unpublished Practical Essay on the Curative Agency of Neuro-Hypnotism
(1842) as an abbreviation for "neuro-hypnotism", meaning
"nervous sleep". Braid fiercely opposed the views of the
Mesmerists, especially the claim that their effects were due to an
invisible force termed "animal magnetism", and the claim
that their subjects developed paranormal powers such as telepathy.
Instead, Braid adopted a skeptical position, influenced by the
philosophical school of Scottish
Common Sense Realism, attempting to explain the Mesmeric phenomena
on the basis of well-established laws of psychology and physiology.
Hence, Braid is regarded by many as the first true
"hypnotist" as opposed to the Mesmerists and other
magnetists who preceded him.
Braid ascribed the "mesmeric
trance" to a physiological
process resulting from prolonged attention to a bright moving object
or similar object of fixation. He postulated that "protracted
ocular fixation" fatigued certain parts of the brain and caused a
trance—a "nervous sleep" or, from the Greek,
"neuro-hypnosis."
Later Braid simplified the name to
"hypnotism" (from the Greek
hypnos, "sleep").
Finally, realizing that "hypnotism" was not a kind of
sleep, he sought to change the name to "monoideism"
("single-idea-ism"), but the term "hypnotism", and
its cognate "hypnosis", have stuck.
Braid is credited with writing the
first ever book on hypnotism, Neurypnology (1843). After
Braid's death in 1860, interest in hypnotism temporarily waned, and
gradually shifted from Britain to France, where research began to
grow, reaching its peak around the 1880s with the work of Hippolyte
Bernheim and Jean-Martin
Charcot.
Jean-Martin
Charcot
Jean-Martin
Charcot
The neurologist Jean-Martin
Charcot (1825-1893) endorsed hypnotism for the treatment of hysteria.
La méthode numérique("The numerical method") led to
a number of systematic experimental examinations of hypnosis in France,
Germany,
and Switzerland.
The process of post-hypnotic suggestion was first described in this
period. Extraordinary improvements in sensory acuity and memory were
reported under hypnosis.
From the 1880s the examination of
hypnosis passed from surgical doctors to mental health professionals.
Charcot had led the way and his study was continued by his pupil, Pierre
Janet. Janet described the theory of dissociation,
the splitting of mental aspects under hypnosis (or hysteria) so skills
and memory could be made inaccessible or recovered. Janet provoked
interest in the subconscious and laid the framework for reintegration
therapy for dissociated personalities.
Holy See
Objections had been raised by some
theologians stating that, if not applied properly, hypnosis could
deprive a person of their faculty of reason. Saint
Thomas Aquinas specifically rebutted this, stating that "The
loss of reason is not a sin in itself but only by reason of the act by
which one is deprived of the use of reason. If the act that deprives
one of his use of reason is licit in itself and is done for a just
cause, there is no sin; if no just cause is present, it must be
considered a venial sin."
On July 28, 1847, a decree from the Sacred
Congregation of the Holy office (Roman
Curia) declared that "Having removed all misconception,
foretelling of the future, explicit or implicit invocation of the
devil, the use of animal magnetism (Hypnosis) is indeed merely an act
of making use of physical media that are otherwise licit and hence it
is not morally forbidden, provided it does not tend toward an illicit
end or toward anything depraved."
American
Civil War
Hypnosis was used by field doctors in
the American
Civil War and was the first extensive medical application of
hypnosis. Although hypnosis seemed to be very effective in the field[citation
needed], with the introduction of the hypodermic
needle and the general chemical anesthetics of ether
in 1846 and chloroform
in 1847 to America, it was much easier for the war's medical community
to use chemical anesthesia than hypnosis.
Ambroise-Auguste
Liébeault
Ambroise-Auguste
Liébeault (1864-1904), the founder of the Nancy
School, first wrote of the necessity for cooperation between the
hypnotizer and the participant, for rapport.
Along with Bernheim,
he emphasized the importance of suggestibility.
Hippolyte
Bernheim
Hippolyte
Bernehim is considered by some experts to be the most important
figure in the history of hypnotism. [8]
Along with Ambroise-Auguste
Liébeault he founded the Nancy
School which became the dominant force in hypnotherapeutic theory
and practice in the last two decades of the 19th century.
William
James
William
James (1842-1910) the pioneering American psychologist discussed
hypnosis in some detail in his Principles of Psychology.
First
International Congress, 1889
The First International Congress for
Experimental and Therapeutic Hypnotism was held in Paris, France, on
August 8-12, 1889. Attendees included Jean-Martin
Charcot, Hippolyte
Bernheim, Sigmund
Freud and Ambroise-Auguste
Liébeault. The second congress was held on August 12-16, 1900.
British
Medical Association, 1892
The Annual Meeting of the BMA, in
1892, unanimously endorsed the therapeutic use of hypnosis and rejects
the theory of Mesmerism (animal magnetism). Even though the BMA
recognized the validity of hypnosis, Medical Schools and Universities
largely ignored the subject.
20th
Century Hypnotism
Emile Coué
Emile
Coué (1857-1926), a French
pharmacist and founder of the New
Nancy School, broke away from hypnotism to develop his own method
of "conscious autosuggestion." He became one of the most
influential early 20th century self-help teachers.
Boris
Sidis
Boris
Sidis
Boris
Sidis (1867-1923), a Ukraine-born American psychologist and
psychiatrist who studied under William
James at Harvard
University, formulated this law of suggestion:
Suggestibility varies as the amount of
disaggregation, and inversely as the unification of consciousness.
Disaggregation refers to the split between the normal waking
consciousness and the subconscious.
Johannes
Schultz
The German psychiatrist Johannes
Schultz adapted the theories of Abbe
Faria and Emile
Coué and identifying certain parallels to techniques in yoga
and meditation.
He called his system of self-hypnosis Autogenic
training.
Gustav Le
Bon
Gustave
Le Bon's study of crowd
psychology compared the effects of a leader
of a group to hypnosis. Le Bon made use of the suggestibility
concept.
Sigmund
Freud
Hypnosis, which at the end of the
19th century had become a popular phenomenon, in particular due to
Charcot's public hypnotism sessions, was crucial in the invention of psychoanalysis
by Sigmund
Freud, a student of Charcot. Freud later witnessed a small number
of the experiments of Liébeault
and Hippolyte
Bernheim in Nancy. Back in Vienna he developed abreaction
therapy using hypnosis with Josef
Breuer. When Sigmund Freud discounted its use in psychiatry, in
the first half of the last century, stage hypnotists kept it alive
more than physicians.
Platanov
and Pavlov
Russian medicine has had extensive
experience with obstetric hypnosis. Platanov, in the 1920s, became
well known for his hypno-obstetric successes. Impressed by this
approach, Stalin later set up a nationwide program headed by Velvoski,
who originally combined hypnosis with Pavlov
techniques but eventually used the latter almost exclusively. Ferdinand
Lamaze, having visited Russia, brought back to France
"childbirth without pain through the psychological method,"
which in turn showed more reflexologic
than hypnotic inspiration.
20th
Century Wars
The use of hypnosis in the treatment
of neuroses flourished in World
War I, World
War II and the Korean
War. Hypnosis techniques were merged with psychiatry and was
especially useful in the treatment of what is known today as Post
Traumatic Stress Disorder.
William
McDougall
William
McDougall (1871-1944), an English psychologist, treated soldiers
with "shell shock" and criticised certain aspects of
Freudian theory such as the concept of abreaction.
Clark L.
Hull
The modern study of hypnotism is
usually considered to have begun in the 1920s with Clark
Leonard Hull (1884-1952) at Yale
University. An experimental psychologist, his work Hypnosis and
Suggestibility (1933) was a rigorous study of the phenomenon,
using statistical and experimental analysis. Hull's studies
emphatically demonstrated once and for all that hypnosis had no
connection with sleep ("hypnosis is not sleep, … it has no
special relationship to sleep, and the whole concept of sleep when
applied to hypnosis obscures the situation").
The main result of Hull's study was
to rein in the extravagant claims of hypnotists, especially regarding
extraordinary improvements in cognition or the senses under hypnosis.
Hull's experiments did show the reality of some classical phenomena
such as hypnotic anaesthesia
and post-hypnotic
amnesia. Hypnosis could also induce moderate increases in certain
physical capacities and change the threshold of sensory stimulation;
attenuation effects could be especially dramatic.
Andrew
Salter
In the 1940s, Andrew
Salter (1914-1996) introduced to American therapy the Pavlovian
method of contradicting, opposing, and attacking beliefs. In the
conditioned reflex, he has found what he saw as the essence of
hypnosis. He thus gave a rebirth to hypnotism by combining it with classical
conditioning. Ivan
Pavlov had himself induced an altered state in pigeons, that he
referred to as "Cortical Inhibition", which some later
theorists believe to be some form of hypnotic state.
British
Hypnotism Act
In Britain,
in 1952, a Hypnotism Act was instituted to regulate stage hypnotists'
public entertainments.
British
Medical Association, 1955
On April 23, 1955, the British
Medical Association (BMA) approved the use of hypnosis in the areas of
psychoneuroses and hypnoanesthesia in pain management in childbirth
and surgery. At this time, the BMA also advised all physicians and
medical students to receive fundamental training in hypnosis.
1956,
Pope's approval of hypnosis
The Roman
Catholic Church banned hypnotism until the mid-20th century when,
in 1956, Pope
Pius XII gave his approval of hypnosis. He stated that the use of
hypnosis by health care professionals for diagnosis and treatment is
permitted. In an address from the Vatican on hypnosis in childbirth,
the Pope gave these guidelines:
Hypnotism is a serious matter, and not
something to be dabbled in.
In its scientific use, the
precautions dictated by both science and morality are to be followed.
Under the aspect of anaesthesia, it
is governed by the same principles as other forms of anaesthesia.
American
Medical Association, 1958
In 1958, the American Medical
Association approved a report on the medical uses of hypnosis. It
encouraged research on hypnosis although pointing out that some
aspects of hypnosis are unknown and controversial.
American
Psychological Association
Two years after AMA approval, the
American Psychological Association endorsed hypnosis as a branch of
psychology.
Ernest
Hilgard and others
Studies continued after the Second
World War. Barber, Hilgard, Orne and Sarbin also produced substantial
studies.
In 1961, Ernest
Hilgard and André
Weitzenhoffer created the Stanford
scales, a standardized scale for susceptibility to hypnosis, and
properly examined susceptibility across age-groups and sex.
Hilgard went on to study sensory
deception (1965) and induced anesthesia and analgesia
(1975).
Milton
Erickson
Milton
Erickson (1901-1980) developed many ideas and techniques in
hypnosis that were very different from what was commonly practiced.
His style, commonly referred to as Ericksonian
Hypnosis, has greatly influenced many modern schools of hypnosis.
Harry
Arons
In 1967, Harry Arons, a self-taught
professional hypnotist, wrote a textbook, Hypnosis in Criminal
Investigation, dedicated to the application of hypnosis in the
judicial system. Chapters include such applications such as memory,
age regression, induction techniques and confabulation. Arons also
traveled the country training law enforcement agencies. His teaching
created national acceptance in the legal community and increased
positive awareness to the practice of hypnosis for trial applications.
Dave Elman
Dave
Elman (1900-1967) helped to promote the medical use of hypnosis in
the 1960s. Elman's definition of hypnosis is still used today among
some professional hypnotherapists. Although Elman had no medical
training, he is known[who?]
for having trained the most physicians and psychotherapists in
America, in the use of hypnotism.
He is also known[who?]
for introducing rapid inductions to the field of hypnotism. One method
of induction which he introduced more than fifty years ago, is still
one of the favored inductions used by many of today's practitioners.
He placed great stress on what he
termed "the Esdaile state" or the "hypnotic
coma", which, according to Elman, had not been deliberately
induced since Scottish surgeon James
Esdaile last attained it. This was an unfortunate and historically
inaccurate choice of terminology on Elman's part. Esdaile
never used what we now call hypnosis even on a single
occasion; he used something loosely resembling mesmerism
(also known as animal
magnetism).
Ormond
McGill
Ormond
McGill (1913-2005), stage hypnotist and hypnotherapist, was the
"Dean of American Hypnotists"[citation
needed] and writer of the seminal "Encyclopedia of
Genuine Stage Hypnotism" (1947). McGill died on October
19, 2005.
U.S.A.Definition
for Hypnotherapist
The U.S. (Department of Labor)
Directory of Occupational Titles (D.O.T. 079.157.010) supplies the
following definition:
"Hypnotherapist -- Induces hypnotic
state in client to increase motivation or alter behavior pattern
through hypnosis. Consults with client to determine the nature of
problem. Prepares client to enter hypnotic states by explaining how
hypnosis works and what client will experience. Tests subject to
determine degrees of physical and emotional suggestibility. Induces
hypnotic state in client using individualized methods and techniques
of hypnosis based on interpretation of test results and analysis of
client's problem. May train client in self-hypnosis conditioning.
UK
National Occupational Standards
National Occupational Standards (NOS)
for Hypnotherapy was published in 2002 by Skills for Health, the
Government's Sector Skills Council for the UK health industry.The
Qualifications and Curriculum Authority started conferring optional
certificates and diplomas in international level through National
Awarding Bodies by assessing learning outcomes of training
/accrediting prior experiential learning
Indian
Restriction
The Ministry of Health & Family
Welfare, Government of India, vide its letter no.R.14015/25/96-U&H(R)
(Pt.) dated 25 November, 2003, has very categorically stated that
hypnotherapy is a recognized mode of therapy in India to be practiced
by only appropriately trained Personnel.
Contemporary
researchers
Nicholas
Spanos
Nicholas
Spanos, who died in 1994, was Professor of Psychology and Director
of the Laboratory for Experimental Hypnosis at Carleton
University and a leading nonstate theorist and hypnotic skills
training researcher.
Martin
Orne
Martin
Theodore Orne was a professor of psychiatry at the University
of Pennsylvania who researched demand
characteristics and hypnosis.
Footnotes
^ There
is not a single reference to the use of the term hypnosis in
English language literature prior to the return to England of those
who had early contacts with the Nancy
School, and had taken on the Nancy School's theoretical mis-representations
of Braid's true position (e.g., such as their assertions that Braid
had never used suggestion, etc.).
^
Braid, J. “Magic, Mesmerism, Hypnotism, etc., Historically and
Physiologically considered”, 1844-1845, vol. XI., pp. 203-204,
224-227, 270-273, 296-299, 399-400, 439-41.
^
Braid, J. (1846). The Power of the Mind over the Body
^ Haque,
Amber (2004), "Psychology from Islamic Perspective: Contributions
of Early Muslim Scholars and Challenges to Contemporary Muslim
Psychologists", Journal of Religion and Health 43
(4): 357–377 [365], doi:10.1007/s10943-004-4302-z
^
H.F. Ellenberger, The Discovery of the Unconscious, Basic
Books, 1980.
^
Braid, J. “The Power of the Mind over the Body; an Experimental
Inquiry into the Nature and Cause of the Phenomena attributed by Baron
Reichenbach and others to a ‘New Imponderable’”, vol. LXVI.,
1846, p. 286.
^
Braid, J. “The Power of the Mind over the Body; an Experimental
Inquiry into the Nature and Cause of the Phenomena attributed by Baron
Reichenbach and others to a ‘New Imponderable’”, vol. LXVI.,
1846, p. 286.
^
Weitzenhoffer, A. (2000). The Practice of Hypnotism.
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