Charcot operated a clinic at the Pitié-Salpêtrière Hospital (thus, known as the "Paris School" or the "Salpêtrière School"), while Bernheim had a clinic in Nancy (known as the "Nancy School"). Charcot, who was influenced more by the Mesmerists, argued that hypnotism was an abnormal state of nervous functioning found only in certain hysterical women. He claimed that it manifested in a series of physical reactions that could be divided into distinct stages. Bernheim argued that anyone could be hypnotised, that it was an extension of normal psychological functioning, and that its effects were due to suggestion. After decades of debate, Bernheim's view dominated. Charcot's theory is now just a historical curiosity.[59]

Barber et al. noted that similar factors appeared to mediate the response both to hypnotism and to cognitive behavioural therapy, in particular systematic desensitization.[35] Hence, research and clinical practice inspired by their interpretation has led to growing interest in the relationship between hypnotherapy and cognitive behavioural therapy.[70]:105[113]
“Before attending the Hypnotherapy Academy of America, I had already had over 500 hours of hypnotherapy training; however, I felt that I was missing some important concepts and skills, so I went to the Academy hoping to get what I was unable to get from other training. My goals were completely fulfilled. I received a solid foundation in hypnosis and hypnotherapy and learned how to take hypnotherapy to new heights and greater depths. As a result of the Academy training, I now do hypnotic work more efficiently and more effectively than with my prior training. Because the quality of my work as a hypnotherapist has significantly improved through the Academy training, I can offer greater value to my patients, and I can more easily market my practice.
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]

"How long will I spend in therapy?", is like asking, "How long is a piece of string?" Everyone is different and everyone's individual needs and circumstances vary. There is no definitive answer. However, while some talking therapies can require commitments of a year or more, hypnotherapy tends to be a much faster solution. The average length of time I spend with a client is around 4-6 weekly sessions, to create sustainable changes which some have been trying to implement for years.
State theorists interpret the effects of hypnotism as due primarily to a specific, abnormal, and uniform psychological or physiological state of some description, often referred to as "hypnotic trance" or an "altered state of consciousness". Nonstate theorists rejected the idea of hypnotic trance and interpret the effects of hypnotism as due to a combination of multiple task-specific factors derived from normal cognitive, behavioural, and social psychology, such as social role-perception and favorable motivation (Sarbin), active imagination and positive cognitive set (Barber), response expectancy (Kirsch), and the active use of task-specific subjective strategies (Spanos). The personality psychologist Robert White is often cited as providing one of the first nonstate definitions of hypnosis in a 1941 article:
     "I feel now I am ready to express an experience that has transformed my life and in the process the lives of lots of people! To begin with, I could not have imagined that I would no longer feel my (formerly) chronic backache. I have learned to relax the muscles and actually pass on the healing thoughts and energy to the pain areas. The changes in my life are nothing short of a miracle. Healing my personal relationships has been the highlight....
“I arrived at the Hypnotherapy Academy of America believing that I had paid for and would receive the most comprehensive hypnotherapy training in the world. What I didn’t expect, however, was to find myself in an environment where I would have so many profound life transforming experiences. By the end of the second week I was completely in awe and felt that our class had already gotten more than our money’s worth. Upon completion of the course, I feel sure of two things. First, that I’m fully prepared to begin a successful hypnotherapy practice. Second, that my life will never be the same again.”
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Before long, hypnotism started finding its way into the world of modern medicine. The use of hypnotism in the medical field was made popular by surgeons and physicians like Elliotson and James Esdaille and researchers like James Braid who helped to reveal the biological and physical benefits of hypnotism.[50] According to his writings, Braid began to hear reports concerning various Oriental meditative practices soon after the release of his first publication on hypnotism, Neurypnology (1843). He first discussed some of these oriental practices in a series of articles entitled Magic, Mesmerism, Hypnotism, etc., Historically & Physiologically Considered. He drew analogies between his own practice of hypnotism and various forms of Hindu yoga meditation and other ancient spiritual practices, especially those involving voluntary burial and apparent human hibernation. Braid's interest in these practices stems from his studies of the Dabistān-i Mazāhib, the "School of Religions", an ancient Persian text describing a wide variety of Oriental religious rituals, beliefs, and practices.
It is used for a wide variety of applications, and studies into its efficacy are often of poor quality[2] which makes it difficult to determine efficacy. Several recent meta-analyses and systematic reviews of the literature on various conditions have concluded that the efficacy of hypnotherapy is "not verified",[3] that there is no evidence[4][5] or insufficient evidence[6][7] for efficacy.