The inner life
Binaural beats
Direct answer
Binaural beats are a slow pulsing that is heard when each ear is given a steady tone of slightly different pitch through headphones. The pulse is made in the brain, not in the air.
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At a glance
- Also called
- binaural tones, brainwave entrainment, binaural audio
- Found in
- Consciousness & Spiritual Psychology
- Related
- Frequency, Resonance, Concert pitch, Mindfulness
Binaural beats are a slow pulsing that is heard when each ear is given a steady tone of slightly different pitch through headphones. The pulse is made in the brain, not in the air.
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What are binaural beats?
When a tone of 200 hertz is played to one ear and a tone of 210 to the other, the listener hears a single tone that seems to throb ten times a second. No such throbbing exists in either signal: it arises where the brain combines what the two ears report. That is a binaural beat, and it only appears through headphones and at low pitches.
Since the 1970s recordings have been sold on the idea that the brain's own electrical rhythms fall into step with the beat, so that a slow beat favours sleep or calm and a faster one favours focus. Studies do not bear this out reliably. Some find small effects on mood or attention, many find none, and measurements of brain rhythms mostly fail to show the entrainment claimed.
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What sets Binaural beats apart
Two tones close in pitch played into the same air produce an ordinary beat, a real swelling and fading of the sound. The binaural beat is different in kind: each ear receives a perfectly steady tone, and the throbbing exists only in the nerve pathways of the brainstem where the two inputs meet. It is faint, it disappears above roughly 1,000 hertz, and it needs headphones. Oster valued it for that reason, as a probe of how hearing locates sound, and noted that some people with certain nerve conditions cannot hear it at all.
- First described: Heinrich Wilhelm Dove, 1839
- Heard as: a pulse at the difference between the two tones
- Limits: carrier tones below about 1,000 hertz; differences under about 30
- Needs: headphones, one tone to each ear
- Brought to notice: Gerald Oster, Scientific American, 1973
- A 2023 review: most studies did not show the brain falling into step
Often mistaken for something else: A monaural beat is in the sound itself and can be heard with one ear; a binaural beat is made by the brain from two steady tones, one in each ear.
The story behind Binaural beats
The Prussian physicist Heinrich Wilhelm Dove described the effect in 1839. It stayed a curiosity of the laboratory until 1973, when Gerald Oster set it out in Scientific American as a tool for studying hearing. In the same decade Robert Monroe, who wrote of out-of-body travel, built recordings on it and patented a method in 1975, and his institute sold them widely. Online recordings multiplied from the 2000s. A systematic review of 2023 found the studies of brain rhythms inconsistent, with more failing to show entrainment than showing it.
Why Binaural beats matters
Binaural beats is a real and curious fact of hearing with large claims built on it, a clear case for telling an effect from what is sold with it.
How to read Binaural beats
A reader looks it up after meeting a recording that offers sleep, focus or altered states, to learn what the sound is and what was tested.
Binaural beats in practice: an example
Through headphones a listener hears one soft tone that wobbles slowly; lifting one earpiece away makes the wobble vanish.
Where readings of Binaural beats go wrong
Listen quietly: loud headphones harm hearing. People with epilepsy are usually advised to ask a doctor before listening to pulsing sound.
Sources and editorial method
This entry summarizes the tradition in the Almanac's own words; where no source is listed, it is an editorial summary rather than a primary text, and symbolic readings are named as the tradition's, not as fact.
- Source
- The Great Almanac Dictionary
- Category
- Consciousness & Spiritual Psychology
- Aliases
- binaural beat, binaural tones, brainwave entrainment, binaural audio
- Last updated
- 2026-09-26
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Common questions
What are binaural beats?
They are a slow pulsing heard when each ear is given a steady tone of slightly different pitch through headphones. The pulse is produced by the brain as it combines the two signals.
Do binaural beats work?
The beat itself is real. The claim that it sets the brain to a chosen state is not established: a 2023 review found most studies could not show it, though pooled analyses of small trials report a modest effect on attention, memory and anxiety.
Who discovered binaural beats?
The physicist Heinrich Wilhelm Dove described them in 1839. Gerald Oster brought them to wider notice in 1973, and recordings for the public followed in the 1970s.
