Working memory is the mental notepad you use to hold a phone number, follow a conversation or do sums in your head. 15 Hz is a low beta frequency that has been tested directly on working-memory tasks.
What the research on 15 Hz binaural beats shows
In a study comparing six sound conditions (silence, pure tone, classical music, and 5, 10 and 15 Hz beats), only 15 Hz significantly improved accuracy on an N-back working-memory task. EEG showed more efficient brain networks during the task 1.
In a mental-fatigue study, accuracy stayed steady throughout a draining task with 15 Hz beats but dropped mid-task with 40 Hz beats or relaxing music. Questionnaire and reaction-time scores did not differ between groups 2.
A QEEG study found that 15 Hz beats produced a measurable response in the left hemisphere within about five minutes 3.
How to use 15 Hz
Use 15 Hz for tasks that load your mental notepad: coding, spreadsheets, mental math and multi-step instructions. It is also a reasonable choice for the afternoon slump, when mental fatigue sets in.
How to listen
- Use headphones for binaural beats. Each ear needs its own tone. Isochronic tones work on speakers.
- Start before the task. A meta-analysis found that listening before (or before and during) a task worked better than listening only during it, and that longer sessions helped.
- Keep the volume low. The beat works at a comfortable, quiet level. Louder is not better.
- One goal at a time. Studies tested one beat frequency at a time. You can layer sounds in Neuro Gardens, but there is no evidence that stacked frequencies add up.
About the evidence
Binaural-beat research is promising but uneven. Studies are often small and use different settings, and a 2023 systematic review found that only 5 of 14 EEG studies showed the brain following the beat frequency (Ingendoh 2023). We rate each frequency honestly, link every study to PubMed, and update these pages as new research is published.
Frequently asked questions
What are 15 Hz binaural beats good for?
Two EEG studies link 15 Hz to better working-memory accuracy and steadier performance during mentally fatiguing tasks.
Can binaural beats help with brain fog?
"Brain fog" is not a research term, but one study found that 15 Hz beats helped people keep their accuracy during a mentally fatiguing task. Persistent brain fog is worth discussing with a doctor.
Studies cited
All studies link to PubMed, run by the National Library of Medicine at the U.S. National Institutes of Health (NIH).
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The effect of binaural beats on verbal working memory and cortical connectivity
Beauchene C, Abaid N, Moran R, Diana RA, Leonessa A · Journal of Neural Engineering · PMID 28145275
Of six sound conditions (silence, pure tone, classical music, 5, 10 and 15 Hz beats), only 15 Hz significantly improved accuracy on an N-back working-memory task.
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Wang X, Lu H, He Y, Sun K, Feng T, Zhu X · Brain Sciences · PMID 36138896
During a fatiguing task, accuracy held steady in the 15 Hz group but dropped mid-task in the 40 Hz and relaxing-music groups. EEG suggested more efficient brain networks after 15 Hz. Questionnaire and vigilance scores did not differ between groups.
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The brain responses to different frequencies of binaural beat sounds on QEEG at cortical level
Jirakittayakorn N, Wongsawat Y · IEEE EMBC Proceedings · PMID 26737340
Over 30 minutes, beats produced frequency-specific patterns: 6 Hz raised activity across the brain within 10 minutes, 15 Hz and 3 Hz favored the left hemisphere, 10 Hz the right, and 40 Hz the frontal lobe. 8 and 25 Hz had no clear effect.
Try 15 Hz in Neuro Gardens
Pick Working Memory on the outcome wheel, choose music from ambient, jazz, lo-fi, classical or nature, and press play. Audio keeps going with your screen locked.
Get notified at launchNeuro Gardens is a general wellness app, not a medical device, and is not intended to diagnose, treat, cure or prevent any disease. Studies cited here are research on binaural beats in general, not tests of Neuro Gardens. Never listen to low frequencies while driving.