What are binaural beats?
How does it arise?
If the left ear hears 200 Hz and the right ear 206 Hz, the two sounds never mix in the air; each ear hears only its own tone. Neurons in the brainstem that compare the input from both ears detect that the phase difference between the tones changes 6 times per second. The result is a sound that swells and fades 6 times a second: a 6 Hz binaural beat.
The beat is most distinct when the carrier tones are low (a few hundred hertz). As the carrier rises and the difference grows, the effect weakens; differences above a few tens of hertz are heard as two separate tones rather than a beat.
Why are headphones needed?
Played through a speaker, the two tones mix in the room and reach both ears. What you hear then is an acoustic (monaural) beat, not a binaural one. A binaural beat requires the left and right channels to stay completely separate; that is why Frekans Studio computes binaural layers separately and measures leakage between channels in lossy exports.
Does it change brainwaves?
A measurable EEG response can appear at the beat frequency, but it is weak and has not been shown to change mental states reliably. Phrases such as "locks the brain to a target frequency" or "tunes your brainwaves" go beyond the evidence, so we don't use them.
What does the evidence say?
The brain may show a weak response at the beat frequency; this response has not been shown to reliably change mental state.
▲ C · Preliminary/mixed evidence- What do we know?
- The brainstem responds at the two tone frequencies, while a measurable EEG response at the beat frequency can occur in the cortex; for binaural beats it is weaker than for monaural beats and weakens further under white-noise masking.
- What don't we know?
- In a review of 14 EEG studies, only 5 were consistent with the entrainment hypothesis and 8 contradicted it. It has not been shown that this response reliably changes mental state; in one study mood did not change at all.
Some studies report short-term relaxation; results are inconsistent.
▲ C · Preliminary/mixed evidence- What do we know?
- Meta-analyses and pre-surgery trials report short-term reductions in anxiety; the effect against blank audio looks large, but heterogeneity between studies is very high. Of 12 randomized trials on stress, 8 reported a positive result on at least one measure and 4 found no difference. In a 2025 preoperative trial, anxiety fell slightly more in the binaural beat group than in an unstimulated control; it fell in both groups.
- What don't we know?
- Some controlled studies found no effect: in a surgical trial with 90 patients in Türkiye, binaural and isochronic groups did not differ from a no-sound group, and in an online study of 58 people, 40 Hz beats did not change a single-item anxiety rating. Randomization and blinding are unclear in most studies, and adverse effects are rarely studied.
Evidence is weak and conflicting; in some studies binaural beats lowered test performance.
▲ C · Preliminary/mixed evidence- What do we know?
- Two meta-analyses found a moderate overall effect: one on memory and attention only (g = 0.40), the other also pooling anxiety and pain (g = 0.45); they partly share studies. In a small parametric study, 40 Hz beats with a low (340 Hz) carrier and a white-noise background improved general attention but did not prevent attention from declining over time.
- What don't we know?
- Results conflict. In two home experiments with 1,000 people in total, 5 Hz and 15 Hz beats lowered reasoning-test scores, while silence and other sounds had no effect. In a 58-person study, 40 Hz beats did not affect attention. Positive findings need replication. In a three-experiment study, 16 Hz binaural beats did not improve sustained attention; the combined data gave evidence against this hypothesis.
Evidence levels and sources come from the database; the article adds no new claims. Evidence methodology
Frequently asked questions
- Do binaural beats work through speakers?
- No. Through a speaker the two tones mix in the room and you hear an acoustic beat. For listening without headphones, monaural beats or isochronic tones are used.
- Which beat frequency does what?
- The effects attributed to bands (delta, theta, alpha…) largely derive from EEG observations; no specific beat has been shown to reliably produce a specific mental state. Session cards state the level of evidence for every claim.
- Is it safe?
- At a low, comfortable volume no serious risk has been reported; still, if you have a history of epilepsy or another health condition, talk to your doctor first. Stop listening if you feel any discomfort.
Listen and try
Last updated: 1 October 2026 · This article is for information only; it is not medical advice.