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Dr.Gérald Oster was the first to highlight the effect of this type of sounds on brain waves in the context of a research on hearing acuity; he was also the one who named them "binaural sounds". These are sounds listened with the help of a stereo headphone whose frequency differs from one ear to another (similar sound content but different tones).
Robert Monroe, founder of the Monroe Institute of Applied Sciences in Virginia, USA, then conducted studies on the effects that could produce different types of sounds on the acceleration of learning process. In 1958, he set up a multidisciplinary team of researchers composed of specialists in the fields of psychology, medicine, biochemistry, psychiatry, electrical engineering, physics... who have studied these phenomena widely and have discovered special combinations of tones and frequencies producing specific effects in man. Of the thousands of possible frequency combinations that could be replicated, Monroe and his team selected fifty three that had very positive effects on the brain.
Thousands of participants followed the seminars of the Monroe Institute and its methods are used by more than 2 million people worldwide, including in hospitals, universities, the U.S. State Department, the business world, etc.
This knowledge has become widespread, and many videos of binaural sounds are available free online to remedy all kinds of difficulties or optimize learning, sleep, recovery, etc.