They are hypnosis tapes. Usually one side leads the person through an NLP technique and the other uses a story (metaphor- a technique from Ericksonian Hypnosis.) I'm a hypnostist and an NLP practitioner and also have many hypnosis tapes, and there is no difference in the trance state I'm in with Paraliminals and other tapes or when I do self-hypnosis. I also consider the Silva Method and Imagestreaming to be hypnosis. Watching a movie is also hypnosis. From an NLP perspective much more falls under the category of hypnosis than what someone trained in an authoritarian style would consider hypnosis. I guess it really depends on what someone's definition of the word "hypnosis" is.
