Cognitive effects are the least supported

Evidence context

Evidence type

Published systematic review of interventional clinical trials, conducted by independent researchers with no relationship to Fluctara.

Evidence level

human interventional

Population or setup

Ten interventional trials published between 2015 and 2025: eight randomised controlled trials, two crossover studies, and two quasi-experimental pre-post designs, together covering approximately 970 participants with individual sample sizes from 18 to 262. Participants were predominantly college and university students aged 19 to 24, with a smaller number drawn from perioperative and dental settings.

Result

Anxiety reduction showed small-to-moderate effects, with standardised differences from 0.36 to 0.47, and larger effects in clinical anxiety contexts than in student samples. Theta-frequency binaural beats showed a stronger effect on physiological stress markers, around 0.59, alongside increases in high-frequency heart-rate variability. Cognitive performance was the most variable domain: where an effect size could be extracted at all it was around 0.34, and in part of the literature it could not be extracted. Beta-frequency beats were associated with more modest cognitive benefits. The reviewers concluded that these interventions can beneficially modulate sleep, anxiety, and cognitive processes, while stating that heterogeneity and small samples limit the certainty of that conclusion.

Uncertainty

The reviewers rated certainty as low to moderate. Risk of bias across domains was 52 per cent low, 44 per cent some concerns, and 4 per cent high; recent pre-registered trials scored well while earlier ones reported randomisation and attrition incompletely. Heterogeneity in intervention parameters was substantial enough that the reviewers judged a definitive meta-analysis impossible. Some effect sizes were read off figures or estimated from reported data rather than taken from stated values, which introduces imprecision. The reviewers state that publication bias cannot be ruled out because trials reporting null results may be underrepresented.

Limitations

• Certainty of evidence was rated low to moderate by the reviewers themselves.
• Heterogeneity across intervention parameters was judged severe enough to preclude a definitive meta-analysis, so the numbers above are not pooled estimates.
• Some effect sizes were extracted from figures rather than reported values, introducing measurement imprecision.
• Samples were predominantly college and university students aged 19 to 24, which limits generalisation to anyone else.
• Publication bias cannot be ruled out; trials finding nothing may be underrepresented.
• Many included studies were early-phase, with small samples and limited blinding.
• The trials tested binaural-beat audio in general. None of them tested audio generated by Fluctara.
• A group-level average says nothing about what any individual experienced.

Evidence references

• Music and binaural beat interventions for young adults: A systematic review of effects on anxiety, sleep, and cognition. Acta Neuropsychiatrica, Cambridge University Press. Available at https://www.cambridge.org/core/journals/acta-neuropsychiatrica/article/music-and-binaural-beat-interventions-for-young-adults-a-systematic-review-of-effects-on-anxiety-sleep-and-cognition/4282E1152FD3EACA5DF8304935165202 — full text reviewed 2026-08-29.

Correction history

1. No correction is published for this revision.

Related programme

No public programme relationship is approved for this record.