What is Binaural Beats?
Binaural Beats are created by playing two slightly different frequencies (e.g., 100 Hz in the left ear, 104 Hz in the right). The brain perceives the difference (4 Hz) as a third, "phantom" beat. They are used for entrainment toward theta, alpha, or other states.
Key Points
- •Stereo required — each ear must receive a different frequency
- •Frequency-following — the perceived beat may influence dominant EEG frequency
- •State shifting — different beat frequencies target different states (e.g., 4 Hz for theta)
Why do Binaural Beats matter?
Binaural beats matter mainly as a popular, low-cost tool people try for relaxation, focus, or sleep, and as a research window into how the brain combines sound from both ears. The perceived "beat" is created inside the auditory brainstem, not in the air.
The evidence for their effects is limited and mixed. Some small studies report modest changes in anxiety or attention, while others find no difference from plain music or silence. Claims that they reliably "entrain" brainwaves or produce specific mental states are not well supported.
What affects Binaural Beats?
Several factors shape whether binaural beats are perceived and whether they seem to help. Headphones are required, because each ear must receive a separate tone. The carrier tones need to be fairly low in pitch and close in frequency for the beat to be heard clearly. Listening duration, volume, and whether the tones are mixed with music vary widely across studies, which makes results hard to compare. Expectation also plays a large role: believing a track will relax you can produce real calming effects on its own, so well-controlled studies are needed to separate the beat from placebo.
In ONDA Life
The Neural Entrainment article covers binaural beats and closed-loop neural sync protocols.