Entrainment With Binaural Beats

Binaural beats or binaural tones are artificially induced rhythms that the brain produces when exposed to two separate sounds one in the left and the other in the right ear. The beat that is created is the difference between the two frequencies. For example, if 300 Hz is played in one ear and 310 Hz in the other, then the binaural beat would have a frequency of 10 Hz.

Stereo headphones must be used to create this effect because a different sound must be played into each ear. The frequencies used must be below 1,000 hertz and the difference between the tones must be 30 Hz or less. If not the effect will not occur and the two sounds will be heard as two rather than one different beat. 

Binaural beats are better known than other brainwave entrainment tones but they have been found to be less effective than isochronic tones. For this reason we do not use binaural beats alone.

In some of our Sleep Sound and other audios binaural beats are used in tandem with monaural sounds to create what is known as harmonic box x. This is more effective than binaural beats alone.

One advantage of binaural beats over isochronic tones is that they tend to sound better and so are more relaxing to the listener. Where isochronic tones are used they need to be embedded in music or white noise so that the tones are less obvious.

How Binaural Beats Work

Perceived human hearing is limited to the range of frequencies from 20 Hz to 20,000 Hz, but the frequencies of human brain waves are below about 40 Hz. To account for this lack of perception, binaural beat frequencies are used. Beat frequencies of 40 Hz have been produced in the brain with binaural sound and measured experimentally.

When the perceived beat frequency corresponds to the delta, theta, alpha, beta, or gamma range of brainwave frequencies, the brainwaves entrain to or move towards the beat frequency. For example, if a 315 Hz sine wave is played into the right ear and a 325 Hz one into the left ear, the brain is entrained towards the beat frequency 10 Hz, in the alpha range.

Since alpha range is associated with relaxation, this has a relaxing effect or if in the beta range, more alertness. An experiment with binaural sound stimulation using beat frequencies in the Beta range on some participants and Delta/Theta range in other participants, found better vigilance performance and mood in those on the awake alert state of Beta range stimulation.

Binaural beat stimulation has been used fairly extensively to induce a variety of states of consciousness, and there has been some work done in regards to the effects of these stimuli on relaxation, focus, attention, and states of consciousness.

 Studies have shown that with repeated training to distinguish close frequency sounds that a plastic reorganization of the brain occurs for the trained frequencies and is capable of asymmetric hemispheric balancing. [source Wikipedia]

 

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