The Scientific name of the technique is, binaural beats.
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What does it do?
Playing tones with a slightly different frequency in each ear causes the brain to recalculate the frequency and to create a new frequency inside the brain, a frequency that doesn't actually exist outside of the brain.
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When was this technique discovered?
This technique was first discovered over a hundred years ago. However, mainstream science took little interest in it until recently.
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What is so special about it?
In the 70's researchers discovered an amazing phenomenon. When playing binaural beats, the brainwaves synchronize according to the frequency differences and move toward the new frequency. For instance, if we play a 230 Hz tone in the left ear and a 240 Hz tone in the right, the difference is 10 Hz. Thus our brainwaves will move toward the 10 Hz frequency. Brainwaves are categorized in five frequency types: delta, theta, alpha, beta, and gamma. Each type has different characteristics of mood, state of mind, behavior, and consciousness. By playing binaural beats, we can actually change our brainwaves to any state we desire. For instance, we can change an anxious person’s brainwaves from the beta state to the alpha state, which is a relaxed state of mind.
Pink noise is similar to white noise. It sounds like static from a radio or television.
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Why do you play tones with background sounds or pink noise?
For some, listening to pure binaural beats is unpleasant. Adding background sounds and noises doesn't change the effect but makes binaural beats more pleasant to hear.
