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Courtesy of World of Alternatives Newsletter

Brainwave 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 Program
Binaural Beats 
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

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when headphones are used. Instead, the brain produces the pulse by combining the two tones. Each ear hears only a steady tone. Monaural Beats
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 or here

Isochronic Beats
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 

Frequency Following
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 large.
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. 

Brainwave Harmonics
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 meditations, stress reduction, astral projection, remote 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 management, accelerated learning, chakra stimulation, manifestation 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 and the isochiral music suites.
In 2012 the same team developed the innovative AromaRife frequencies – this being a series of healing frequencies based on the vibrational properties of aromatherapy oils combined with the renowned healing Rife Frequencies

In 2013 the audio crystal therapy series was launched after many years of research. The frequencies emulate the intrinsic vibrations of specific crystals; generating the same healing and therapeutic functions.

In 2014 the isochiral gamma max ( using high intensity gamma frequencies ), Mind Sync 3D ( an innovative combination of frequency types) and reverse speech subliminals ( a new approach to mind control ) were added to the catalogue

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