Here is text from the Foundations and Research article in the Paraliminal section of the website:

o Double Induction/Confusion

Upon first listening, two independent messages coming into different ears can be confusing. This confusion is actually an integral part of the Paraliminal technology. Developed over years of clinical research, Dr. Erickson refined what he called his "Confusion Technique".

It is essentially a way of playing with the communication in order to "...introduce progressively an element of confusion into the question of what is meant, thereby leading to an inhibition of responses called for but not allowed to be manifested and hence to an accumulating need to respond." (Haley, 1967, p. 156)

The confusion technique is primarily a hypnotic technique to bypass the critical mind. Since the critical/logical mind cannot respond, the paraconscious tends to take over, building up a strong potential to respond. This technique was further developed by Grinder and Bandler in their lecturing style during the mid and late 1970's. It was then picked up and refined as a "double-induction" of hypnosis by Drs. Steve Gilligan and Paul Carter in their seminars on Ericksonian hypnosis.

Paraliminal learning sessions, by the nature of their dual-voice effect, create the Ericksonian phenomenon. The resulting positive effects are best achieved when the tape is listened to from start to finish. This allows for the progressive introduction of confusion. One of the key reasons why listeners are instructed to create a "special time" for listening to the tape in its entirety is to enhance this effect.

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In the late 1980s, Paul Scheele and his colleague Mark Kinnich did double induction sessions with their individual clients, and the results were very good.

Unfortunately, it required both Paul and Mark to work with the client.

We decided to do Paraliminals in early 1988 at the insistence of our clients who wanted us to put our technology on tape, because they were not satisfied with their experiences with other tapes on the market.

After doing double inductions with Mark, Paul wanted to do a tape with them.

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As far as the HPP tapes: they are pretty good. While they are similar to the Paraliminals they are also different on several levels. If you do both, you should catch the commonalities as well as the divergences.

It seems that most people who like one also like the other. When someone doesn't like one, it is usually a personal preference relating to Paul's or Lloyd's voice, or because one better suited the listeners purpose.