Sound Therapy &
entrainment or 'brainwave synchronization', is any practice that
aims to cause brainwave frequencies to fall into step with a periodic stimulus
having a frequency corresponding to the intended brain-state (for example, to
induce sleep), usually attempted with the use of specialized software. It
purportedly depends upon a 'frequency following' response on the
assumption that the human brain has a tendency to change its dominant EEG
frequency towards the frequency of a dominant external stimulus. Many
softwares exist where you can create your own brainwave entrainment patterns.
A good example would be the Neurovector
Binaural Beats deserve special mention because of the manner in which the
desired frequencies are obtained. Brainwave entrainment may be achieved when
audio signals are introduced to the brain causing a response directly related
to the frequency of the signal introduced, called binaural beats. Two tones
close in frequency generate a beat frequency at the difference of the
frequencies, which is generally subsonic. For example, a 495 Hz tone and 505
Hz tone will produce a subsonic 10 Hz tone, roughly in the middle of the alpha
range. The resulting subsonic tone may affect the state of mind of the
subject. The 'carrier frequency' (e.g., the 500 Hz in the example
above), is also said by some to affect the quality of the transformative
experience. Note that this effect is achieved without either ear hearing
the pulse when headphones are used. Instead, the brain produces the pulse by
combining the two tones. Each ear hears only a steady tone.
Monaural Beats are the result of the arithmetic (vector) sum of the waveforms
of the two tones as they add or subtract from one another, becoming louder and
quieter and louder again.
Monaural and binaural beats are rarely encountered in nature, but in man-made
objects, monaural beats occur frequently. For example, two large engines
running at slightly different speeds will send 'surges' of
vibrations through the deck of a ship or jet plane. The lower pitched tone, is
called the carrier and the upper tone is called the offset.
Monaural beats occur in the open air and external to the ears. For example,
when two guitar strings of slightly different frequencies are plucked
simultaneously. Monaural beats strike the ear as beats and therefore excite
the thalamus, an action crucial for entrainment. Binaural beats played through
loudspeakers become monaural beats.
To hear monaural beats, both tones must be of the same amplitude. However
binaural beats can be heard when the tones have different amplitudes. They can
even be heard if one of the tones is below the hearing threshold. Noise
reduces the perceived volume of monaural beats whereas noise actually
increases the loudness of binaural beats. Good examples of monaural beat
programs can be found here
Isochronic tones are regular beats of a single tone used for brainwave
entrainment. Similar to monaural beats, the interference pattern that produces
the beat is outside the brain so headphones are not required, but since
isochronic tones are more pronounced, the stimuli is even stronger. They
differ from monaural beats which are a sine wave pulse rather than entirely
separate pulses of a single tone.
Isochronic tones work by the contrast between the 'on' and 'off' settings in the noise. because off is nothing, and on is on,
there is a high level of contrast. this contrast causes your brain to change
its thought patterns. Good examples of isochronic beat programs can be found here.
Sound Therapy Library
30,000 free ebooks, downloads and softwares covering
sound therapy, brainwave entrainment and much more...
in your name and e-mail address to receive free access to the
password will be sent to you
(make sure your spam filter is
switched off to allow delivery).
library is completely free. You will never be asked for a
If binaural frequencies are applied to the brain, it becomes possible to
entrain the brain frequency from one stage to another. For example, if a
person is in beta state and a binaural frequency of 12Hz is applied to their
brain for some time, the brain frequency is likely to change towards the
applied frequency. The effect will be relaxing to the person. This phenomenon
is also called frequency following response.
When the brain's dominant frequency is close to the applied frequency,
entrainment works more efficiently. Thus, when doing a sweep from one
frequency to another, the starting frequency should be as close to your
current brain state as possible. The sweep speed should be such that your
brain's state changes steadily with it, so that the difference never gets very
You could liken the effect to a tuning fork or the harmonic vibration of a
glass. Most of the brainwave harmonic programmes start from 18Hz - 20Hz and
sweep down to the required harmonic.
In 2001, a team of scientists in the UK discovered that certain dominant
brainwave frequencies or combinations of brainwave frequencies produced very
specific altered states of consciousness. Initially this involved the use of
pure sine wave frequency generators, binaural stereo mixing and close
frequency following. The key to success with this technique was the production
and stabilization of the absolutely correct brainwave pattern for each altered
state. This could only be achieved if no distractions (such as musical content
or speech) were included in the programs. Initially, the correct patterns for deep
viewing and psychic
amplification were successfully developed. More research followed and more
functional patterns were discovered; stimulating the brain with certain
frequency combinations allowed for pain
and more. This technique became the Mind
Sync Technology range.
In 2007, the same team developed the Medipower
range. This used the same close frequency following technique and targeted
the same brainwave harmonics patterns. The main difference was the use of isochronic
beat technology instead of binaural beat technology. This allowed the user
to benefit from the programs without the need for headphones.
In 2010, the same team used a novel sound engineering approach which allowed
them to use non distracting music for the first time. The same binaural
harmonic patterns and frequency following were incorporated into the binaural
music range. The same technique has, for the first time, allowed the
combination of brainwave harmonic patterning, frequency following, binaural
stereo mixing, isochronic beats and music to create the chakra
and kundalini suites.
experience the effect of binaural harmonics and the brainwave
frequencies, a recommended product is the Meditation Course.
does it work?
calibrated sine wave frequency generators were used to generate
different frequencies in each ear.
meditation course works through the alpha level, theta level and
delta level in sequence. Each level has its own unique
meditation course contains the full versions of the alpha,
theta and delta inductions. You can purchase either the download or CD versions below.
here to listen to
a sample of pure brainwave harmonics