Binaural Stimulation Method and the Altered State of Consciousness(Research Papers,The 35th Symposium on Life Information Science)

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  • 両耳聴性変則音刺激と変性意識(研究発表論文)

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Hemi-Sync^[○!R] is well known as an exploration program of consciousness. It is a method that leads users easily into a deep relaxed state and into a different state of consciousness by applying auditory stimulations of slightly different frequencies to the left and right ears. The authors have already measured many EEGs in various altered states of consciousness; this time they tried to examine changes in the brain while listening to a Hemi-Sync^[○!R] CD by making EEG measurements of five trainers of the method. Amplitudes of the occipital α waves decreased during the session; that is, the subjects seemed to become a little sleepy. However, as the α band percent ratios were not decreased so much, it was considered to be somewhat different from the usual sleep stage. The β band ratio showed alternate changes for focus levels, F10 and F12 There seemed to be some relationships with the binaural beat frequency caused by the difference of sound frequencies for each ear. EEG coherences between the left and the right hemispheres tended to become larger during the session. Some EEGs, however, showed phase-synchronized patterns from the occipital to the frontal area, like the meditation EEGs, so it was considered that this method might easily lead to the meditation state and higher coherence values might be produced.

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