Binaural beats or binaural tones are auditory processing artifacts, or apparent sounds, the perception of which arises in the brain independent of physical stimuli. The brain produces low frequency pulsations or “beats” when two tones are presented separately at slightly different frequencies. Binaural beats involve different neurological pathways than ordinary auditory processing.

For example if a 340 Hz tone played into the right ear and a 330 Hz tone was played into the left ear the brain is entrained towards the beat frequency of 10 Hz. Since this alpha range is related to relaxation it produces the sensation of relaxation in the brain and body.

Brain waves and their related frequencies.

Frequency range	Name	Usually associated with:
> 40 Hz	Gamma waves	Higher mental activity, including perception, problem solving, fear, and consciousness
13–40 Hz	Beta waves	Active, busy or anxious thinking and active concentration, arousal, cognition
7–13 Hz	Alpha waves	Relaxation (while awake), pre-sleep and pre-wake drowsiness
4–7 Hz	Theta waves	Dreams, deep meditation, REM sleep
< 4 Hz	Delta waves	Deep dreamless sleep, loss of body awareness

Through this process you can induce varied states of consciousness. The dominant frequencies determine your current state. So if your brain’s alpha waves are dominant your in a relaxation state regardless of other waves that are present in less amounts.

Influencing brain waves has been shown to be more effective if you start with a frequency close to your current state and work down.

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