Research library
Method
What we will not include
Internal policy
Some popular methods do not yet meet our evidence bar.
Binaural beats, subliminal audio, and most 'productivity supplements' are excluded. The published evidence is mixed, often industry funded, and inconsistent enough that any effect is hard to separate from placebo.
What the research shows
Garcia Argibay et al. (2019) meta analysis on binaural beats reported an overall medium effect on cognition but with high heterogeneity between studies, so the real world benefit stays uncertain.
Where evidence is weaker
Absence of evidence is not evidence of absence. We may add these tools later if independent replication strengthens.
How Focus Capsule applies it
We include brown noise, pink noise, and nature soundscapes, where the evidence is stronger and the mechanism is plausible.