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Yes, there are are studies which support the use of frequency "sweeps" vs. fixed frequencies; in fact this approach was included in a patent held by Dr. Harold Russell, Dan Vaughn and myself. One common misconception which has propagated in the LS field is that there are very precise frequencies which produce specific esoteric or medical effects. Though there is some basis for this (i.e., Tansey uses and touts 14 Hz neurofeedback for ADHD, though others more generally use the SMR range of which 14 Hz is a component), it is very unlikely that a fractional Hz will produce the same effect on everyone. That's why we made the Proteus programmable--the included sessions are intended as much as examples as anything else.
Back to frequency sweeps within a band, for example 9-12 Hz: you would be correct if you are suggesting that this is less effective than stimulation at a given user's "ideal" frequency within a band (for example, 10 Hz might be the "best" one for you). However, stimulating at a fixed frequency can lead to habituation: a lessening response to that frequency over time. So, varying the frequency is in part intended to sidestep stimulus induced habituation. Some studies have show that stimulating near an individual's ideal frequency can enhance amplitude at that frequency as well. I would post more details about these studies, except the FDA would consider this medical "labeling" and we do want to comply with their regulations. A good place to research LS studies is Pubmed (freely available online) and psychlit (fee based but usually available from State University libraries; I do my main research at the University of Washington).
In summation of the above quote: In some cases, it is beneficial to target specific brain waves however, you may have better results using a sweep of the frequencies in a targeted range. (For example, if your goal is to have an alpha state dominate, then you would write your program around the 8 - 11/12 Hz range instead of just focusing on let's say 10Hz for the entire program).
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what would be my intention when setting it to a frequency of 50?
or why would i vary the brightness level( it seems to me that other than an initial fade you would want it at full brightness). i am also perplexed by the variation in audio pitch. i amslo do not understand the difference in the sound tables. basically i don't understand very much.
I'm going to leave these answers to someone who has more expertise in this subject as I don't want to embarrass myself by writing the wrong answers. LOL Robert ... Todd...