Optional musical layer — pairs with the frequency tones above

The Schumann resonance is a real, measured standing wave in the Earth-ionosphere cavity (~7.83 Hz, with harmonics near 14.3/20.8/27.3/33.8 Hz). These sit below audible pitch, so they're produced here as a beat frequency — see Beat Mode above — rather than a direct tone. Any effect on brainwave activity beyond the underlying physics is not settled science.

— start audio —

🎧 headphones recommended · binaural mode

Enable to begin 5·5 coherent breathing

Coherent breathing at 0.1 Hz synchronises heart rate variability

🔊 Starting a session will also start audio