It was proposed that a binaural beat occurs in the brain if you apply
slightly different frequency sine waves independently but
simultaneously to each ear. This beat effect is created by the brain
itself and is largely due to the structure of the brain’s internal
wiring.
These binaural beats are auditory brainstem responses, originating in the
the superior olivary nucleus of each hemisphere of the brain due to the
interaction between the two different impulses.
The frequency of the two tones is between one and 30 Hz. Let us take the
example that the difference between the two tones is 10 Hz. This 10
Hz difference is experienced within the superior olivary nuclei as a
beat. The brain has a tendency, through the frequency following
response, to resonate at the same frequency as the auditory stimuli
being presented. In our example, this would be 10 Hz, which is the
frequency of the Alpha state. If we offer a binaural frequency of 5
Hz, the brain will begin to resonate with that and produce Theta
brainwaves. If we present a binaural beat of 3 Hz, Delta brainwaves
are detected. Alpha, Theta and Delta brainwaves are connected to
altered states of consciousness that can be used to reprogram the
subconscious mind, eliminate negative thought schemas and release
the emotional connection to memories.
In layman's terms, all that this means is that you can relax, put on some
stereo headphones and let your mind synchronize with the binaural
beat frequency to create real measurable changes in your mind and
body.
There are immediate benefits of using these beats such as the creation of
relaxed states, aided sleep or even energy boosts. However, this is
not the limit of binaural beat technology. It is also possible to
produce very unusual states of consciousness like lucid dreaming,
creativity, out-of-body experiences, and transcendental meditation,
to name but a few. However, there are also very real permanent
benefits of using binaural beat technology. This technology has
been used to create some very dramatic life changes.
These technologies can be expensive but the overall benefits of there use
are immeasurable. However, there are cheap alternatives to both the
above mentioned. Binaural beats in audio technology now come in
affordable one CD sets. These can be used to instantly create a
variety of different states such as sleep, meditation, creativity,
lucid dreaming, etc. You can also get your hands on software to create
your own binaural beats but I believe, when dealing with brain
entrainment, this should be left to those with more experience. The
technology is fascinating and it works but you really won't know that
until you try it yourself.