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Isochronic tones


Isochronic tones are regular beats of a single tone that are used alongside monaural beats and binaural beats in the process called brainwave entrainment. At its simplest level, an isochronic tone is a tone that is being turned on and off rapidly. They create sharp, distinctive pulses of sound.

More than twenty-one independent peer-reviewed, placebo-controlled studies have been conducted between 1979 and 2012 which show a range of cognitive-behavioral benefits achieved through the practice of temporarily altering brain waves, including: cognitive enhancement after 6 weeks of gamma wave stimulation; improvement in academic achievement after beta brain wave stimulation; increase in alpha wave strength measured by EEG during meditation; substantial reduction in anxiety and corresponding increase in relaxation after theta wave stimulation; and reduction of headache pain, reduction of anxiety, and improved sleep after delta wave stimulation. These temporary benefits may be sustained over the long term by incorporating routine practice of audio-visual entrainment technologies and mindfulness meditation.

Audio-visual entrainment (AVE) refers to the use of flashes of lights and pulses of tones to purposefully guide the brain into various states of brain wave activity. By stimulating the brain with flashing LED lights built into special eye glasses and pulsing auditory tones (isochronic tones) transmitted through headphones within a frequency range of about 0.5 to 25 Hertz, it is possible to shift the frequency of the dominant brain waves either higher or lower and thereby change brain function.

A 2001 study by Le Scouarnec RP, et al., found "monaural beats can produce brainwave entrainment inasmuch as they are in beat form before striking the ear drum, which impacts the thalamus, and therefore the cortex. EEG studies of monaural beats have conclusively shown that monaural beats produce a frequency following response in the contralateral hemisphere of the brain, and are therefore quite useful for entrainment."


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