Brainwaves have been altered in many ways over the centuries using many different methods. Africans and North American Indians have done it with flickering fires and drum beats, usually to obtain a state of excitement and violence associated with a battle. In the East it has been used to cause a religious fervour usually with music and girating.

In the modern era and the advent of electronics it is very easy to alter the brain waves, now we know their frequency. Below is a list of these frequencies and their uses and effects.

There are quite a few ways these waves can be altered, the main being visual and acoustic. The visual method can easilly be done by feeding the output of the brainwave monitor to some LED`s set into a pair of glasses. The acoustic method requires only headphones to be plugged into the monitor. Deap relaxation can be obtained by using the feedback as an indicator to lower your beta waves. Deap trance states can be obtained with training. The reverse can be done by increasing the rate of certain waves to cause excitement. Nausea and vomiting can occure when these waves are taken to the extreme.

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