Binaural or isochronic?
Where's the difference?
With a binaural beat each ear hears its own tone; the fluctuation arises in the brainstem where the two signals combine. That's why stereo headphones are needed and the fluctuation is subtle.
With a monaural beat the two tones mix in one signal; the fluctuation is in the air, in the sound itself. An isochronic tone switches on and off at regular intervals. Both can be heard on speakers and the fluctuation is distinct.
Which should you choose?
The choice mostly depends on the listening situation and taste: without headphones, monaural or isochronic; for a softer sound, binaural. The sharp pulses of isochronic tones can feel tiring to some people.
Frekans Studio states each session's technique and evidence level separately; it doesn't present the technique itself as a claim of superiority.
What does the evidence say?
No method has been shown to be superior.
■ D · Insufficient evidence- What do we know?
- In a 16-person EEG study, monaural beats produced a stronger cortical response than binaural beats, but mood did not change with either. In a surgical trial with 90 patients, there was no anxiety difference between binaural and isochronic groups. In a 221-person home study, monaural and binaural beats did not differ from each other or from a beat-free sound in sleep latency.
- What don't we know?
- There are not enough studies directly comparing the methods on meaningful outcomes, and a stronger EEG response has not been shown to mean a better outcome.
Evidence for effects on relaxation or focus is insufficient; we offer it as a listening experience.
■ D · Insufficient evidence- What do we know?
- Monaural beats produce a measurable EEG response at the beat rate; in a 16-person study it was stronger than for binaural beats, while mood did not change. The linked sources have no EEG data for isochronic tones. In people prone to mind wandering, monaural theta beats reduced mind wandering compared with a sine tone; a reduction compared with silence appeared only in a subgroup.
- What don't we know?
- Very few controlled studies test effects on relaxation or focus directly. In a surgical trial with 90 patients in Türkiye, isochronic tones did not reduce anxiety compared with no sound.
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.
Evidence levels and sources come from the database; the article adds no new claims. Evidence methodology
Frequently asked questions
- Do isochronic tones work without headphones?
- Yes. The fluctuation is in the sound itself, so it can be heard on speakers too.
- Which produces a stronger brain response?
- In a small study monaural beats produced a stronger EEG response. This did not translate into a difference in mood or performance.
Listen and try
Last updated: 1 October 2026 · This article is for information only; it is not medical advice.