Pierre Janet originally developed the idea of dissociation of consciousness from his work with hysterical patients. He believed that hypnosis was an example of dissociation, whereby areas of an individual's behavioural control separate from ordinary awareness. Hypnosis would remove some control from the conscious mind, and the individual would respond with autonomic, reflexive behaviour. Weitzenhoffer describes hypnosis via this theory as "dissociation of awareness from the majority of sensory and even strictly neural events taking place."[38]

Braid can be taken to imply, in later writings, that hypnosis is largely a state of heightened suggestibility induced by expectation and focused attention. In particular, Hippolyte Bernheim became known as the leading proponent of the "suggestion theory" of hypnosis, at one point going so far as to declare that there is no hypnotic state, only heightened suggestibility. There is a general consensus that heightened suggestibility is an essential characteristic of hypnosis. In 1933, Clark L. Hull wrote:
Also Receive Training In Clinical Hypnosis. Robert Sapien is a physician and a tenured Distinguished Professor at the University of New Mexico Health Sciences Center.  He serves as principal investigator on several research studies and is recognized nationally as an expert in emergency asthma care and school emergencies.  Dr. Sapien formerly served as the Chief of Pediatric Emergency Medicine at UNM Hospital.  After graduating from the Academy’s clinical hypnotherapy program, he returned as an Associate Instructor and Practical Skills Coach.  Dr. Sapien has incorporated hypnosis in the emergency care of children, as well as conducting grand rounds and other C.M.E. in-services on the use of medical support hypnosis.
Still reading. From what I have read so far and what I have been told, this really is the definitive basis and should be in the knowledge base and library of any serious student of this subject. I have read most of the newer important writings and I still am finding this to be quite worthy of my time. If you are on the fence, I recommend waiting for a decent deal and then making the purchase.
But for the comparison between PHA and functional amnesia to be most meaningful, we need to know that they share underlying processes. One way to test this is to identify the brain activity patterns associated with PHA. In a groundbreaking study published in Neuron, neuroscientist Avi Mendelsohn and colleagues at the Weizmann Institute in Israel did just that using functional magnetic resonance imaging (fMRI). They carefully selected 25 people to participate in their experiment. Although all were susceptible to hypnosis, earlier testing had shown that half could respond to a PHA suggestion (labelled “the PHA group”) and half could not (the “non-PHA group”). In the Study session of their experiment, participants watched a 45-minute movie. One week later, in the Test session, participants returned to the laboratory and were hypnotized while they lay within the fMRI scanner. During hypnosis, people in both the PHA and non-PHA groups received a suggestion to forget the movie until they heard a specific cancellation cue.
Following the French committee's findings, Dugald Stewart, an influential academic philosopher of the "Scottish School of Common Sense", encouraged physicians in his Elements of the Philosophy of the Human Mind (1818)[54] to salvage elements of Mesmerism by replacing the supernatural theory of "animal magnetism" with a new interpretation based upon "common sense" laws of physiology and psychology. Braid quotes the following passage from Stewart:[55]
After developing a substantial following — “mesmerism” became “the height of fashion” in late 1780s Paris, writes Marchant — Mesmer became the subject of what was essentially the world’s first clinical trial. King Louis XVI pulled together a team of the world’s top scientists, including Benjamin Franklin, who tested mesmerism and found its capacity to “cure” was, essentially, a placebo effect. “Not a shred of evidence exists for any fluid,” Franklin wrote. “The practice … is the art of increasing the imagination by degrees.”
Children are more easily hypnotized than adults, and hypnotherapy as a method responds to the general developmental needs of children by addressing their ability for fantasy and imagination. Hypnotherapy and self-hypnosis are tools with which to assess and develop protective factors, and enhance positive adjustment. Meta-analyses and overviews have demonstrated the effect of hypnotherapy in paediatric disorders like asthma, chronic and acute pain, and in procedure-related distress in cancer patients. We wanted to examine the use and benefits of hypnotherapy when applied to child psychiatric disorders. A review of a literature search from PubMed, PsychINFO and the Cochrane databases revealed 60 publications, mostly case reports based on 2-60 cases, addressing the use of hypnotherapy in various child psychiatric conditions. Findings indicate that hypnotherapy may be useful for a wide range of disorders and problems, and may be particularly valuable in the treatment of anxiety disorders and trauma-related conditions. In conclusion, knowledge of hypnosis is useful in clinical practice and hypnotherapy may play an important role as an adjunctive therapy in cognitive-behavioural treatment and family therapy. Additional qualitative and quantitative studies are needed to assess the place for hypnosis/hypnotherapy in child psychiatry.
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Research on the effectiveness of hypnotherapy on a variety of medical conditions is extensive. In one study, the use of hypnotherapy did not seem to alter the core symptoms in the treatment of attention-deficit hyperactivity disorder (ADHD); however, it did seem to be useful in managing the associated symptoms including sleep disturbances and tics.

Could imbalance in the autonomic nervous system explain the complexity and heterogeneity of autism spectrum disorder (ASD)? Could teaching kids and families affected by ASD skills in autonomic regulation broadly improve comfort and functioning? This is the first of three blog posts on our work at the Center for Applied Psychophysiology and Self-regulation at RIT.

It would be difficult to find an area of scientific interest more beset by divided professional opinion and contradictory experimental evidence…No one can say whether hypnosis is a qualitatively unique state with some physiological and conditioned response components or only a form of suggestion induced by high motivation and a positive relationship between hypnotist and subject…T.X. Barber has produced "hypnotic deafness" and "hypnotic blindness", analgesia and other responses seen in hypnosis—all without hypnotizing anyone…Orne has shown that unhypnotized persons can be motivated to equal and surpass the supposed superhuman physical feats seen in hypnosis.[148]
Suggestion therapy relies on the patient’s ability to respond to suggestions from the hypnotherapist while in this trance-like state. This method is commonly used to control or stop unwanted behaviors such as smoking, gambling, nail biting, or over-eating. It has also been shown particularly useful in treating pain, or increasing the instance of positive behavior such as self-motivation or confidence.
He also believed that hypnosis was a "partial sleep", meaning that a generalised inhibition of cortical functioning could be encouraged to spread throughout regions of the brain. He observed that the various degrees of hypnosis did not significantly differ physiologically from the waking state and hypnosis depended on insignificant changes of environmental stimuli. Pavlov also suggested that lower-brain-stem mechanisms were involved in hypnotic conditioning.[166][167]
According to many sources including the National Center for Biotechnology Information (NCBI) which is part of the United States National Library of Medicine and a branch of the National Institutes of Health (NIH), hypnosis is scientifically proven to help relieve both mental challenges and physical pains. Hypnosis can alleviate stress and reduce pain after surgeries, has been shown to relieve anxiety in children in the emergency room, and can be useful for managing pain associated with everything from arthritis to migraines. Hypnosis is non-invasive and gives you a way to control pain or discomfort that might otherwise seem out of your hands. Hypnosis shouldn’t be used as a substitute for medical care, but may be an excellent complementary tool that is best provided by a trained therapist or licensed medical provider. The University of Maryland Medical Center shares many conditions for which hypnosis can be useful:
The American Psychological Association published a study comparing the effects of hypnosis, ordinary suggestion, and placebo in reducing pain. The study found that highly suggestible individuals experienced a greater reduction in pain from hypnosis compared with placebo, whereas less suggestible subjects experienced no pain reduction from hypnosis when compared with placebo. Ordinary non-hypnotic suggestion also caused reduction in pain compared to placebo, but was able to reduce pain in a wider range of subjects (both high and low suggestible) than hypnosis. The results showed that it is primarily the subject's responsiveness to suggestion, whether within the context of hypnosis or not, that is the main determinant of causing reduction in pain.[138]
For several decades Braid's work became more influential abroad than in his own country, except for a handful of followers, most notably Dr. John Milne Bramwell. The eminent neurologist Dr. George Miller Beard took Braid's theories to America. Meanwhile, his works were translated into German by William Thierry Preyer, Professor of Physiology at Jena University. The psychiatrist Albert Moll subsequently continued German research, publishing Hypnotism in 1889. France became the focal point for the study of Braid's ideas after the eminent neurologist Dr. Étienne Eugène Azam translated Braid's last manuscript (On Hypnotism, 1860) into French and presented Braid's research to the French Academy of Sciences. At the request of Azam, Paul Broca, and others, the French Academy of Science, which had investigated Mesmerism in 1784, examined Braid's writings shortly after his death.[58]

“That study changed the whole landscape,” said Dave Patterson, a psychologist at the University of Washington in Seattle, who has been using hypnosis since the 1980s to help burn victims withstand the intense pain that comes with the necessary but excruciating bandage removal and wound cleaning. Since the ’90s, other well-designed, controlled studies have been published showing similar changes in brain activity. In another slightly trippy example, researchers suggested to people in a hypnotic state that the vibrant primary colors found in paintings by Piet Mondrian were actually shades of gray. “Brain-scan results of these participants showed altered activity in fusiform regions involved in color processing,” notes psychologist Christian Jarrett.
Remember this is real and not a trick. If you choose to use these powerful tools of suggestion you can help people in pain. If they are depressed or stressed, you can make them feel more at ease. You can help someone relax before a public speaking event. It can be therapeutic and help in defeating addictions and bad habits when used with other tools. This is how hypnosis meant to be used. Hypnosis can be used in social situations as long as the person doing the hypnotic induction has the proper training. Don't trust any stranger you meet! Remember: Use these techniques responsibly and only after you have been trained in hypnosis.
Preliminary research has expressed brief hypnosis interventions as possibly being a useful tool for managing painful HIV-DSP because of its history of usefulness in pain management, its long-term effectiveness of brief interventions, the ability to teach self-hypnosis to patients, the cost-effectiveness of the intervention, and the advantage of using such an intervention as opposed to the use of pharmaceutical drugs.[91]

The Federal Dictionary of Occupational Titles describes the job of the hypnotherapist: "Induces hypnotic state in client to increase motivation or alter behavior patterns: Consults with client to determine nature of problem. Prepares client to enter hypnotic state by explaining how hypnosis works and what client will experience. Tests subject to determine degree 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. GOE: 10.02.02 STRENGTH: S GED: R4 M3 L4 SVP: 7 DLU: 77"[8]