Binaural beats

I am truly sorry that I could not upload the image of Ed Light’s skull Xray into the blog, I tried but it did not materialize somehow. But if you are interested there is a link at the end of Ed lights description which will download the image.
Now about binaural beats, it is only recently that I came to know about the German experimenter H.D. Dove. He did the pioneering work on the subject. Binaural beats has to do with your brain. EEG graphs have shown that brain emits different wave patterns at different states of mind. These are called the Alpha, Beta, Theta and Delta waves. Beta waves are emitted when we are fully awake and are going about our business. Alpha is the state we are when we come out of a good nights sleep. This is supposed to be a state in which psychic activity is possible. Theta state is exhibited when we are asleep and Delta state is even farther removed from our normal wakeful state. It has been known that certain frequencies are linked to certain states of mind. Alpha is evident when the individual is in a state of going farther than one normally does i.e. in states of exceptionally high learning and positive thinking . This engendered the idea that the process can be reversely used to create such states of mind artificially, by introducing the frequency into the mind. But there were difficulties. For one thing the human ears can only hear frequencies between 20 to 20,000 Hz. The Alpha state comes within 8 to 12 Hz. This is where Mr. Dove comes to the picture.
He discovered a novel method to introduce low frequencies into the mind. The method is simple enough. It requires head phones. Two separate set of frequencies are fed into the left and right ears, which wary fractionally. Say 300Hz to one ear and 308 Hz to the other ear. The brain is the synthesizing apparatus. When it receives two varying frequencies simultaneously it perceives the frequencies in between the two, of 8Hz and the state of Alpha is introduced.
Some research has gone into the production of binaural software which introduces different states of mind. The following are the frequencies at which different states of mind occurs.
Delta 1 - 3 Hz Deep sleep, lucid dreaming, increased immune functions
Theta 4 - 7 Hz Deep relaxation, meditation, increased memory, focus
Alpha 8 - 12 Hz Light relaxation, "superlearning", positive thinking
Beta 13 - 25 Hz Normal state of alertness, stress, anxiety

It is claimed that a thirty minute session of listening to frequency of 5Hz can replace around two to three hours sleep

I have tried some of the software’s, they do relax us and lessen the tension of life somewhat. As of now I have not been able to go into a state of meditation by the help of these softwares.