This "stroboscopic photo-stimulation produces 'photic driving', the alpha type of brain electrical activity associated with an altered state in which people are susceptible to suggestion". The influence of rhythmic sounds and drums to enter altered states of consciousness is used in different indigenous tribes (see Shamanic music), as well as optical stimulation produced by the flickering light of camp fires or pressing lightly on the eyeballs. The process applied by some of these machines is said to induce brainwave synchronisation or entrainment. The user then "watches" with their eyes closed. Photic mind machines work with flickering lights embedded in sunglasses or a lamp that sits above or facing the user's head. Mind machines can 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. A light and sound machine with headphones and strobe light gogglesĪ mind machine (aka brain machine or light and sound machine) uses pulsing rhythmic sound, flashing light, or a combination of these to alter the frequency of the user's brainwaves.
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