The Brain-The Last Frontier, at least that’s the way I see it. We know so little about it.
Some scientists think that certain sound waves that mimic certain brainwaves can increase brain creativity, intelligence, control pain or alter psychological states. The brain emits waves that oscillate at different frequencies depending on what the person is doing which led to the term “brainwaves.” Using external waves of certain frequencies, scientists have been able to “entrain” or make the brain take on the same wave lengths.
The Power of Sound: How to Manage Your Personal Soundscape for a Vital, Productive, and Healthy Life by Joshua Leeds (Paperback – Feb. 1, 2001) is a book from Amazon.com that goes into more explanation than I give below. Another book from Amazon is A Symphony in the Brain: The Evolution of the New Brain Wave Biofeedback by Jim Robbins (Paperback – Aug. 5, 2008).
1. In the science of brainwave entrainment there are three types of aural or auditory entrainment. One of the first used is Binaural beats. In this system two tones close in frequency generate a beat frequency at the difference of the frequencies. This is generally not heard in awareness because it is subsonic.
For example, a wave length of 495 Hz tone and another wave length 505 Hz tone, one played into each ear, will produce a subsonic 10 Hz tone that is roughly in the middle of the alpha range. That will affect the state of mind of the person listening. Headphones are necessary for this affect to occur. Each ear hears only one of the tones. For more on Binaural beats you can go to http://www.binaural-beats.com/binaural-beats/?pu=false on the web.
2. The second type is Monaural beats, which are not at all the same as binaural. Monaural beats are the result of the arithmetic sum of the waveforms of two tones as they add or subtract from each other, becoming louder and quieter and louder again. If you have been with someone tuning a guitar using two strings, you will be aware of such a wave when the two strings are of only slightly different frequencies.
It should be noted that when Binaural beats are played through loudspeakers they become monaural.
3. The third type is Isochronic tones. These are evenly spaced tones which turn on and off quickly. They are thought to be an effective auditory entrainment method because they elicit strong auditory evoked response from the thalamus and most people find them tolerable. They have hypnotic qualities, particularly when slightly randomized in frequency.
Isochronic tones are thought to be better than binaural because the brain doesn’t adapt to Isochronic tones the way it can to binaural beats. The difference seems to be that while binaural beat create subsonic beats, Ischonic beats are all audible and more pronounced. The brain doesn’t adapt to the rhythmic tones of the Isochronic and learn to ignore them like it does the Binaural. Here is a website that can help you understand Isochonic beats www.Isochronic-Tones.org.
The science seems to suggest that there is a relationship between sound waves and brainwaves and that sound waves can alter brainwaves in positive ways. In the conclusion of a study, “A Comprehensive Review of the Psychological Effects of Brainwave Entrainment,” 2008, by Tina L. Huang, PhD., she says that findings suggest that Brainwave Entrainment is an effective therapeutic tool, but that more studies needed to be conducted. Her studies showed that people suffering from cognitive functioning deficits, stress, pain, headaches/migraines, PMS and behavioral problems benefited from Brainwave Entrainment.
So it appears that with the help of brain entrainment sound wave, the brain is capable of doing some phenomenal things, such as self-healing, improving intelligence, stopping pain, relaxing, meditating, and much more.