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(US5135468A) Method and apparatus of varying the brain state of a person by means of an audio signal

Abstract

A method of varying the brain state of a person includes the steps of supplying the first audio signal to one ear of the person, supplying a second audio signal to the other ear of the person, and substantially continuously varying the frequency of at least one of the first and second audio signals to vary the brain state of the person.

Source: https://patents.google.com/patent/US5135468

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