The secret of brain wave entrainment using sound is by using binaural beats (I'll discuss binaural beats in detail in the next chapter but I’ll briefly cover the main points here). They’re quite easy to replicate on audio CDs and even on the pc itself. That’s why Binaural Beats are one of the most popular techniques used in self-help audio CDs.
Binaural beats occur when you listen to two carrier tones of slightly different frequencies in each ear. Say, for example, you listen to a frequency tone of 300 Hz in the left ear only, and project another tone of 310 Hz into the right ear.
As a result, your brain combines these two tones into a single tone (the scientific term is "amplitude modulated standing wave") of 10 Hz.
What happens is that you’ll hear a single pulsing tone of 10 Hz that has a "wah-wah" sound and rhythm. Actually, you can only "hear" these binaural beats in your mind only. Binaural beats are sub-sonic sounds (Another scientific word for "below the level of human hearing". The human ear can only hear sounds between about 20 Hz to 20,000 Hz.).
The binaural beats are only "perceived" in your mind and not actually heard. I mean, obviously you can’t hear a tone with a frequency of only 10 Hz, right?
If you want to know whether you’re listening to a binaural beat, then try this out.
If you remove the left earphone, leaving the right earphone on, you’ll notice that the sound that you’re hearing changes from a "wah-wah-wah" sound to a flat tone.
Bring the left earphone back and listen to the flat tone changes back to the "wah-wah" tone. Do the same thing with the right earphone and you’ll notice that the same effect.
That’s a quick & simple way of telling if what you’re listening to has any brainwave entrainment or binaural beats embedded in it.
By changing the frequency difference between the two tones, you’ll be able to choose which brain wave frequency you want to entrain to. This enables you to change your brain wave state from Beta to Alpha (7-14 Hz), Theta (3.5-7 Hz) or even a combination of brainwave patterns.
Usually, the binaural beats in self-help products are "hidden" or "masked" behind another sound wave, usually the sound of ocean waves, rain-drops, other sounds of nature or new age music. This makes it a lot more pleasant to hear (Check out the Beginner's Tip below & you'll understand why...)
There are some sites out there selling brain wave entrainment products or "customizable" programs which allow you to determine which frequency to entrain your brainwaves to.
The problem is that some of these programs don’t mask the binaural beats, leaving you with the "raw" binaural beats and tones. I wouldn’t recommend getting these brainwave entrainment programs at all.
You don’t want to hear the binaural beats on their own, without any masking sounds or music. It’s not very pleasant and can be "very disturbing", to say the least.
Some people, especially beginners, can’t take it as there’s too much energy going through their brains. It’s not the most pleasant experience in the world.
Trust me on this...
One of the best brainwave entrainment programs around is the Holosync program by the Centerpointe Research Institute. If you're interested, sign up for a FR-EE Holosync demo CD here. I've also written a review onHolosync, so do check it out if you're interested in my experience using this product.
Brain Wave Entrainment with Light & Sound Machines
Psychologists, researchers and hypnotists have used this knowledge to put their clients into a deep relaxed, peaceful and trance-like state.
It wasn't long before someone decided to commercialize this knowledge. In 1958, a researcher named Sidney Schneider developed the first Brain Wave Synchronizer. Today, they're more commonly known as Mind Machines or Light & Sound Machines. You can easily buy these Light & Sound Machines from self help companies.
People who’ve used Light & Sound machines for brainwave entrainment have told me that they were able to quickly get into a very deep, relaxed and peaceful state, much faster than using just self help audio products.
Frankly, I’m not surprised. Many people are visually-oriented (meaning that they rely more on their sight than their other senses) so a series of flickering lights & sound at the same time should be able to quickly put them into the desired brain wave state.
However, Light & Sound machines aren’t for everyone. The use of these flickering lights can cause epilepsy or seizure in some people. If you have any history of anything like that, you should consult your physician first before using light & sound machines.The Light Center was created as a place where people could come to pray and meditate anytime, any day of the year. It is dedicated to prayer for personal and planetary transformation.” – Light Center website Light & Sound (Mind Machines)