This article is from the Self Improvement FAQ, by Loren Larsen llarsen@cs.clemson.edu with numerous contributions by others.
Q. What is a mind machine?
A. Mind machines are devices used for relaxation or to attempt to
alter brain states. These devices are usually worn on the head
and use light or sound effects. The scientific validity of their
effectiveness has been debated in the group with no conclusive
answers.
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One positive comment is from lydiapolk@aol.com (Lydia Polk):
I bought a Theta Technologies Voyager XL since they dropped the
price from $350 to $200. It works as claimed. It comes with 50
built-in sessions and an additional 25.
We use it primarily to get into delta sleep. But you can buy audio
tapes that are designed to work with it and download session
paramaters into the machine. You can get tapes for all kinds of
self improvement. Highly recommended.
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The two main manufacturers of mind machines in the United States
seem to by Zygon and Theta Technologies. Phone numbers can be
found in Appendix A.
 
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