There are three main methods currently used for brainwave entrainment: Binaural Beats, Monaural Beats and Isochronic Tones.
Binaural beats are the oldest and most widely used technology. Discovered in 1839 by Heinrich Dove, but it wasn’t until 1973 when Gerald Oster wrote “Auditory Beats in the Brain” that scientific research on binaural beats erupted. Our brain produces different types of brainwaves. The frequencies of these waves range from Delta waves (0.5-4 Hz) all the way to Gamma waves (40 Hz+).
However, human ears are only able to pick up frequencies between 20 Hz – 20,000 Hz. Since our ears can’t grasp frequencies below 20 Hz, binaural beats work by fooling our brain.
How? When you listen to binaural beats with headphones, each ear is introduced to a different frequency. When you hear these 2 different frequencies, your brain reacts by perceiving the difference, called a third auditory beat or binaural beat which can then be used to change your neural rhythm.
For example, if you play 30 Hz in one ear and 25 Hz in another ear, your brain will perceive another auditory beat of 5 Hz. You subtract one frequency from the other: 30 Hz – 25 Hz = 5 Hz. Read more