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Michael Landgraf  – Mind States : An Introduction to Light & Sound Technology (Mind Machines)[PDF]A good introduction for those of you who have an interest in Light & Sound machines (often referred to as Mind Machines or AVS Systems).  The book is dated 2002 so some references to hardware available are a bit out-dated now, but the effect of today’s Mind Machines is pretty much the same.What is a Light & Sound machine?Light and sound stimulation systems, often called mind machines, generate precisely timed patterns of modulated sound and light which can gently lead your mind into a variety of interesting and beneficial states of consciousness.These powerful tools can help you relax deeply, experience less anxiety and fall asleep more quickly. They are also favored by those who wish to explore alternate states of consciousness such as meditation, trance/shamanic states, lucid dreaming, ‘magic journeys,’ etc.What are the benefits of using Light & Sound machines?Relax More DeeplyEver have trouble silencing your “monkey mind?” Light and sound stimulation uses completely natural forms of stimulation to gently lead your mind into slower, more tranquil mindstates. Experience Less AnxietyUse of light and sound machines has often been compared to “electronic meditation.” Regular use help reduce anxiety and other common responses to psychological stress. Fall Asleep More QuicklyOne of the most powerful and effective applications of light and sound stimulation lies in its ability to rapidly induce deep, refreshing sleep. Enhanced CreativityWhen you’re in the “twilight” state, you can access the power of your subconscious mind and use it for solving creative problems. You may even find your enjoyment of music and art increasing, with regular use! Discover why Writer’s Digest called one of our systems the “idea generator”! Improved VisualizationFlickering light activates your visual processing mind much more strongly than does ambient light. In fact, most people will “see” a stream of colorful, dreamlike or kaleidoscopic images during a session. If you rely at all on your visual imagination or memory, you’ll find light & sound machines especially beneficial.Accelerate the Learning ProcessLight and sound stimulation can help you improve your school grades, boost verbal IQ, reduce mental stress and focus more clearly on your studies. A recently published study demonstrated a significant increase in college Grade Point Average following regular use.Can Anyone Use Light & Sound Machines?Light and Sound Systems or Mind Machines have been on the market for years. Thousands of users have logged many hours on them with virtually no reported ill effects. But there are some situations and conditions where use of this technology is strongly discouraged. These devices create flickering light, which can cause seizures in persons with photosensitive epilepsy.Individuals with epilepsy (seizure disorders), cardiac arrhythmia, brain tumors, brain cancer, traumatic brain injury (closed head injury), or using powerful psychotropic medication, illegal drugs or who drink alcohol should NOT use a mind machine. To do so may be dangerous to you. If you have any other medical or psychiatric condition consult your physician before using any Light & Sound product.