Because half the useful brainwave frequencies (.3-40Hz) are below the hearing range of the human ear (20Hz-20,000Hz), several techniques have been developed to overcome this physical limitation.
MUSIC MODULATION
Most audio brainwave entrainment is ‘embedded’ into musical soundtracks to enhance the listening experience. Any full spectrum soundtrack can be used, from a symphony to nature sounds to simple background noise.
MONAURAL BEATS
Monaural brainwave entrainment is a single pulsing beat. It can be heard as a ‘click’ or pulse in the music, created by the convergence of two tones emanating from a single speaker.
BINAURAL BEATS
When we hear a sound, we locate the direction it is coming from by detecting the minute the tone differences between each of our ears. Our brainwaves begin to pulse (phase resonance) at the difference between the tones, and using this ‘phase difference’ we detect the direction of the sound.
ISOCHRONIC BEATS
Often used in combination with monaural and binaural beats, Isochronic tones are regular beats of a single tone embedded into a narrow audio bandwidth of the music itself. One frequency band of the music oscillates, leaving the rest of the music untouched.
The full article can be seen on the following link: http://www.brainworksneurotherapy.com/types-brainwave-entrainment
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