In person, this looks strange enough. “There are a lot of ways to go into this state, but one way is to count to three,” Spiegel explains. “On one, you do one thing — look up. Two, two things — slowly close your eyes and take a deep breath. And three, three things — let the breath out, keep your eyes relaxed, and keep them closed. Let your body float. And then let one hand or the other float up in the air like a balloon.” When in this state, the hypnotized person’s hand will rise up into the air, as if on its own accord; Spiegel can reach over and gently pull the hand down, but it will float right back up again, as if it’s filled with helium.
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.
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High hypnotizable people with PHA typically show impaired explicit memory, or difficulty consciously recalling events or material targeted by the suggestion, and a dissociation between implicit and explicit memory, so that even though they can’t recall the forgotten information it continues to influence their behavior, thoughts and actions. The forgetting is reversible—when the suggestion is cancelled, their memories come flooding back. These last two features—the dissociation and reversibility—confirm that PHA is not the result of poor encoding of the memories or of normal forgetting, because the memories return as soon as PHA is cancelled. Rather, PHA reflects a temporary inability to retrieve information that is safely stored in memory. That makes it a useful tool for research.
A typical hypnotherapy session has the patient seated comfortably with their feet on the floor and palms on their lap. Of course, the patient could choose to lie down if that option is available and if that will meet the patient's expectation of hypnosis. The therapist can even set the stage for a favorable outcome by asking questions like, "Would you prefer to undergo hypnosis in this chair or on the sofa?" Once patients make the choice, they are in effect agreeing to undergo hypnosis. Depending on the approach used by the therapist, the next events can vary, but generally will involve some form of relaxing the patient. Suggestions will lead the patient to an increasingly relaxed state. The therapist may wish to confirm the depth of trance by performing tests with the patient. For example, the therapist may suggest that when the eyes close that they will become locked and cannot be opened. The therapist then checks for this by having patients try to open their eyes. Following a successful trial showing the patient's inability to open the eyes, the therapist might then further relax them by using deepening techniques. Deepening techniques will vary for each patient and depend largely on whether the patient represents information through auditory, visual, or kinesthetic means. If the patient is more affected by auditory suggestions, the therapist would use comments such as "You hear the gentle patter of rain on the roof;" or, "The sound of the ocean waves allow you to relax more and more." For the visual person, the therapist might use statements such as, "You see the beautiful placid lake, with trees bending slightly with the breeze." Finally, with the kinesthetic person phrases such as, "You feel the warm sun and gentle breeze on your skin," could be used. It is important for the therapist to know if the patient has difficulty with the idea of floating or descending because these are sometimes used to enhance the experience for the patient. However, if the patient has a fear of heights or develops a feeling of oppression with the thought of traveling downward and going deeper and deeper, suggestions implying the unwanted or feared phenomenon will not be taken and can thwart the attempt.

Franz Mesmer (1734–1815) believed that there is a magnetic force or "fluid" called "animal magnetism" within the universe that influences the health of the human body. He experimented with magnets to impact this field in order to produce healing. By around 1774, he had concluded that the same effect could be created by passing the hands in front of the subject's body, later referred to as making "Mesmeric passes". The word "mesmerize", formed from the last name of Franz Mesmer, was intentionally used to separate practitioners of mesmerism from the various "fluid" and "magnetic" theories included within the label "magnetism".
Several professional organizations and licensing agencies exist for hypnotherapy practitioners. Examples include the American Society of Clinical Hypnosis (ASCH) and the American Association of Professional Hypnotherapists. To be an ASCH member, practitioners must attend at least 40 hours of workshop training, 20 hours of individual training, and have completed at least two years of clinical practice as a hypnotherapist.
In the 2000s, hypnotherapists began to combine aspects of solution-focused brief therapy (SFBT) with Ericksonian hypnotherapy to produce therapy that was goal focused (what the client wanted to achieve) rather than the more traditional problem focused approach (spending time discussing the issues that brought the client to seek help). A solution-focused hypnotherapy session may include techniques from NLP.[13]