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originally posted by: gort51
a reply to: olaru12
Perhaps you are too young to remember "Altered States" from 1980.
As kids we use to stare at our TVs "White Noise" when all the channels switched off after midnight in the old days......all sorts of monsters lurked in those TVs.......
That was until Poltergeist came out...
Researchers in the 1930's and 40's identified several different types of brain waves. Traditionally, these fall into 4 types: - Delta waves (below 4 hz) occur during sleep - Theta waves (4-7 hz) are associated with sleep, deep relaxation (like hypnotic relaxation), and visualization - Alpha waves (8-13 hz) occur when we are relaxed and calm - Beta waves (13-38 hz) occur when we are actively thinking, problem-solving, etc. Since these original studies, other types of brainwaves have been identified and the traditional 4 have been subdivided. Some interesting brainwave additions: - The Sensory motor rhythm (or SMR; around 14 hz) was originally discovered to prevent seizure activity in cats. SMR activity seems to link brain and body functions. - Gamma brain waves (39-100 hz) are involved in higher mental activity and consolidation of information. An interesting study has shown that advanced Tibetan meditators produce higher levels of gamma than non-meditators both before and during meditation. Are you wondering what kind of brain waves you produce? People tend to talk as if they were producing one type of brain wave (e.g., producing "alpha" for meditating). But these aren't really "separate" brain waves - the categories are just for convenience. They help describe the changes we see in brain activity during different kinds of activities. So we don't ever produce only "one" brain wave type. Our overall brain activity is a mix of all the frequencies at the same time, some in greater quantities and strength than others. The meaning of all this? Balance is the key. We don't want to regularly produce too much or too little of any brainwave frequency.