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To explore the potential of this interest, I made some studies of past and present concepts of the waking-unconscious mind. There was supporting evidence that the unconscious recorded all sensory input data while awake and asleep. The problem was to introduce intelligent and organized data during sleep and to provide conscious recall when desired. The limited formal research material available showed contradictory conclusions. Simple reading of data to a sleeping subject produced only fragmentary and erratic results. No comparative studies between induction during deep (delta) sleep and the dreaming state (now termed REM sleep) had been made. Nor had any attempt been made to create deliberately a receptive sleep state with a Pavlovian type of conditioned reflex induced to bring recall at will. To carry out this research in a convenient pattern, I made autohypnotic sound recordings to test various approaches to a workable technique. This seemed to be the first logical step, as results had been obtained along similar lines utilizing hypnotic sleep instead of the natural sleep state. The reason for the use of tape recordings was to depersonalize the technique and to ensure identical tests among different subjects. The tapes were designed for use in a booth isolated from light and sound. The tapes used were deliberately simple in content. There was a period for induction to create hypnotic sleep. Following this, a series of directionsuggestion units were incorporated into a continuing pattern. These varied according to the test and the results desired. Data learning, for example, was confined to multiplication tables (from twelve to twenty-four) and to Spanish and French vocabulary and idiomatic phrases. These were always accompanied by suggestion of full and complete memory and by posthypnotic suggestion that recall could be obtained in the conscious state by a mental-physical cue (such as thinking of the number 555 and tapping fingers on a table five times simultaneously). Each induction tape recording also included a suggestion that the subject would improve both physically and mentally. This affirmation was somewhat more than a generality. No details were suggested as to how this improvement would take place. Yet each functional area of the body—the nervous, circulatory, glandular, and digestive systems—were to be completely "normal," according to the instructions given the subject Both the health and recall suggestions, then, were reinforced with each induction or use of the tape. In light of later incidents, this may have been important Each experimental tape was carefully annotated, with every spoken word identically following a prepared script and routine.