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A mind machine (aka ''brain machine'', in some countries called a ''psychowalkman'') uses pulsing rhythmic sound and/or flashing light to alter the frequency of the user's brainwaves.〔(The Use of Auditory and Visual Stimulation for the Treatment of Attention Deficit Hyperactivity Disorder in Children ). Micheletti, Larry S. Doctoral Dissertation, University of Houston, Houston, Texas〕 Mind machines are said to induce deep states of relaxation, concentration, and in some cases altered states of consciousness, which have been compared to those obtained from meditation and shamanic exploration. The process applied by these machines is also known as brainwave synchronisation or entrainment. Mind machines work by creating a flickering ganzfeld. Since a flickering ganzfeld produces different effects from a static one, mind machines can often also produce a static ganzfeld. A mind machine is similar to a dreamachine in that both produce a flickering ganzfeld. The difference is that a dreamachine can be used by several people at once, but generally has fewer technical features than a mind machine. In the United States, these devices are not FDA-approved for sale. They have been found by a U.S. district court to be Class III medical devices, and consequentially require FDA pre-market approval. None of these devices have obtained this pre-market approval. Several companies selling these devices have been shut down and seen their devices destroyed.〔Farley, Dixie. "Unapproved 'brain wave' devices condemned after seizure reports." FDA Consumer Mar. 1994: Vol. 28 No. 2 p. 41.〕 ==Overview== Mind machines typically consist of a control unit, a pair of headphones and/or strobe light goggles. The unit controls the sessions and drives the LEDs in the goggles. Professionally, they are usually referred to as Auditory Visual Stimulation Devices (AVS devices). Sessions will typically aim at directing the average brainwave frequency from a high level to a lower level by ramping down in several sequences. Target frequencies typically correspond to delta (1-3 hertz), theta (4–7 Hz), alpha (8–12 Hz) or beta brain waves (13–40 Hz), and can be adjusted by the user based on the desired effects. Mind machines are often used together with biofeedback or neurofeedback equipment in order to adjust the frequency on the fly.〔(Mind machines together with online gsr biofeedback ). Happy Electronics〕 Modern mind machines can connect to the Internet to update the software and download new sessions. When sessions are used in conjunction with meditation, neurofeedback, etc. the effect can be amplified. Some clinical research has been done on the use of auditory and visual stimulation to improve cognitive abilities in learning-disabled children ((research) ). 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Mind machine」の詳細全文を読む スポンサード リンク
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