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Binaural Beat Frequencies
Robert Monroe made a remarkable discovery when he learned that the brain processes sound using the super positional effects of interference.
What Are Binaural Beats?
Binaural Beats are the sensation of hearing a throbbing sound, when in fact, you are hearing two constant amplitude sounds in separate ears.
Why Is This Remarkable?
This is remarkable for two reasons.
Our hearing ranges from about 16 Hz to 20,000 Hz. At times in our research, we would like to expose our sound therapy clients to frequencies below 16 hertz, but, we are unable to do that since they are inaudible. Binaural Beats to the rescue. By generating two higher frequencies with the desired difference frequency, we are able to generate the low frequency sounds.
For example, let's say we wanted to support our client with a 4 Hz tone. It is impossible to hear such a low frequency and very difficult to generate. However, if we instead play a tone of say, 160 Hz in one ear and 164 Hz in the other, then the brain combines the two separate tones to produce what seems to be a single tone whose amplitude modulates at 4 Hz. This third sound is created in the brain and is called the binaural beat.
It is just becoming apparent now, and with the invention of Hugo Zuccarell's Holophone Sounds, that the ears are extremely sensitive to phase. Our current understanding of the brain and how it works does not seem to be able to explain how the brain is able to combine the sounds phase information to create the binaural beat effect.
It is interesting to realize that this effect is largely a "sonic illusion," similar to an optical illusion. Our brain processes the sounds and indicates that it is hearing a single sound which is strong varying in amplitude, where, in fact, we are hearing a constant volume sound in each ear. We theorize that this phase processing is strongly related to our ability to detect the location of a sound.
Hopefully we will be able to expand our knowledge in this field in the near future.
Longitudinal Wavelength Sound Waves Pitch and Frequency Speed of Sound Doppler Effect Sound Intensity and Decibels Sound Wave Interference Beat Frequencies Binaural Beat Frequencies Sound Resonance and Natural Resonant Frequency Natural Resonance Quality (Q) Forced Vibration Frequency Entrainment Vibrational Modes Standing Waves Law of Octaves Psychoacoustics Tacoma Narrows Bridge Schumann Resonance Animal BioAcoustics More on Sound
Law Of Octaves Sound Harmonics Western Musical Chords Musical Scales Musical Intervals Musical Mathematical Terminology Music of the Spheres Fibonacci Sequence Circle of Fifths Pythagorean Comma
DrumsDrum Vibrational Modes
Aristotle Copernicus Einstein Fibonacci Hermann von Helmholtz Kepler Sir Isaac Newton Max Planck Ptolemy Pythagoras Thomas Young
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