Evidence from randomized controlled trials indicates that hypnosis, relaxation, and meditation techniques can reduce anxiety, particularly that related to stressful situations, such as receiving chemotherapy (see box). They are also effective for insomnia, particularly when the techniques are integrated into a package of cognitive therapy (including, for example, sleep hygiene). A systematic review showed that hypnosis enhances the effects of cognitive behavioral therapy for conditions such as phobia, obesity, and anxiety.
The song had all the potential to become a surefire hit, from JC’s come-hither vocals to the snakecharmer hypnosis of the production. — Bianca Gracie, Billboard, "In Defense of JC Chasez, *NSYNC's Underappreciated Boy Band Frontman," 24 Apr. 2018 There was even a time when people worried about highway hypnosis, the tendency for smooth, uninterrupted freeways to lull drivers to their doom. — Ian Bogost, The Atlantic, "Driving Without a Smartphone," 10 July 2018 Melissa Errico stars as the hypnosis-seeking Daisy with Stephen Bogardus as the doctor who prefers her past life to her present one. — Alexis Soloski, New York Times, "11 Plays and Musicals to Go to in N.Y.C. This Weekend," 21 June 2018 Texas Department of Public Safety spokesman Tom Vinger says hypnosis is used by trained professionals in only a few cases. — Fox News, "Texas death row inmates push for forensic hypnosis ban," 14 May 2018 Kurczewski thought hypnosis could help get a clear story out of Teri. — jsonline.com, "CHAPTER 5: THE GIRL IN THE CAFÉ," 27 Sep. 2017 The most worrisome of all to Orloff are apps offering help for people experiencing suicide ideation or seeking anxiety release hypnosis. — Ken Alltucker, Alex Connor And Jayne O'donnell, USA TODAY, "Mobile therapy apps: With suicide rates on the rise, can text chats rescue those on the edge?," 15 June 2018 More recently, Sirhan's lawyers have explored whether he was hypnotized to begin shooting his gun when given a certain cue, even hiring a renowned expert in hypnosis from Harvard to meet with Sirhan. — The Washington Post, NOLA.com, "Who killed Bobby Kennedy? His son RFK Jr. doesn't believe it was Sirhan Sirhan," 27 May 2018 More recently, Sirhan’s lawyers have explored whether he was hypnotized to begin shooting his gun when given a certain cue, even hiring a renowned expert in hypnosis from Harvard to meet with Sirhan. — Author: Tom Jackman, Anchorage Daily News, "Who killed Bobby Kennedy? His son RFK Jr. doesn’t believe it was Sirhan Sirhan.," 26 May 2018
The next major development came from behavioural psychology in American university research. Clark L. Hull (1884–1952), an eminent American psychologist, published the first major compilation of laboratory studies on hypnosis, Hypnosis & Suggestibility (1933), in which he proved that hypnosis and sleep had nothing in common. Hull published many quantitative findings from hypnosis and suggestion experiments and encouraged research by mainstream psychologists. Hull's behavioural psychology interpretation of hypnosis, emphasising conditioned reflexes, rivalled the Freudian psycho-dynamic interpretation which emphasised unconscious transference.
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:
Although most practitioners receive their training in hypnotherapy or relaxation as a part of their academic training, the American Society of Clinical Hypnosis and the Society for Clinical and Experimental Hypnosis maintain training programs as well as a registry of practitioners (see previous box). Training in teaching relaxation techniques is provided through various routes from self-teaching and apprenticeships to a number of short courses. Many yoga centers also teach relaxation and offer courses to train yoga teachers.teachers.
Although Dave Elman (1900–1967) was a noted radio host, comedian, and songwriter, he also made a name as a hypnotist. He led many courses for physicians, and in 1964 wrote the book Findings in Hypnosis, later to be retitled Hypnotherapy (published by Westwood Publishing). Perhaps the most well-known aspect of Elman's legacy is his method of induction, which was originally fashioned for speed work and later adapted for the use of medical professionals.
Hypnosis is not a psychotherapeutic treatment or a form of psychotherapy, but rather a tool or procedure that helps facilitate various types of therapies and medical or psychological treatments. Only trained health care providers certified in clinical hypnosis can decide, with their patient, if hypnosis should be used along with other treatments. As with psychotherapy, the length of hypnosis treatment varies, depending on the complexity of the problem.