The common view of hypnosis is that it is a trance-like altered state of consciousness. Many who accept this view also believe that hypnosis is a way of accessing an unconscious mind full of repressed memories, multiple personalities, mystical insights, or memories of past lives. This view of hypnosis as an altered state and gateway to occult knowledge about the self and the universe is considered a myth by many psychologists. There are two distinct, though related, aspects to this mythical view of hypnosis: the myth of the altered state and the myth of the occult reservoir.
Those supporting the altered state theory often cite studies that show that during hypnosis (1) the brain's electrical states change and (2) brain waves differ from those during waking consciousness. The critics of the mythical view point out that these facts are irrelevant to establishing hypnosis as an altered state of consciousness. One might as well call daydreaming, concentrating, imagining the color red, or sneezing altered states, since the experience of each will show electrical changes in the brain and changes in brain waves from ordinary waking consciousness.
Those supporting the unconscious occult reservoir theory support their belief with anecdotes of numerous people who, while hypnotized, (a) recall events from their present or past life of which they have no conscious memory, or (b) relate being in distant places and/or future times while under hypnosis.
Most of what is known about hypnosis, as opposed to what is believed, has come from studies on the subjects of hypnosis. We know that there is a significant correlation between being imaginative and being responsive to hypnosis. We know that those who are fantasy-prone are also likely to make excellent hypnotic subjects. We know that vivid imagery enhances suggestibility. We know that those who think hypnosis is rubbish can't be hypnotized. We know that hypnotic subjects are not turned into zombies and are not controlled by their hypnotists. We know that hypnosis does not enhance the accuracy of memory in any special way. We know that a person under hypnosis is very suggestible and that memory is easily 'filled-in' by the imagination and by suggestions made under hypnosis. We know that confabulation is quite common while under hypnosis and that many States do not allow testimony which has been induced by hypnosis because it is intrinsically unreliable. We know the greatest predictor of hypnotic responsiveness is what a person believes about hypnosis.
