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Neurological Entrainment
Five bands of electromagnetic rhythm govern every state from dreamless sleep to gamma insight — explored through live waveforms, entrainment mechanics, and the physics of neural synchrony.
The five bands
The brain's electrical activity is never a single tone — it is a chord. Delta, theta, alpha, beta, and gamma oscillate simultaneously, each dominant in its own state. Select a band to isolate its signature in the live display.
Entrainment and the binaural beat
Play 200 Hz in the left ear and 207 Hz in the right. The brain resolves the 7 Hz difference as a phantom tone — and begins to oscillate at that frequency. The auditory cortex locks to the beat; the broader network follows. Adjust the target beat frequency to cross between bands.
The arousal spectrum
Each band does not switch on and off — it waxes and wanes along a continuum from deep sleep to peak excitation. Drag the cursor across the spectrum to see which band dominates at each level of arousal.
Coherence — the Kuramoto model
Neural regions aren't just oscillating — they are coupling. The Kuramoto model shows how N oscillators with slightly different natural frequencies spontaneously synchronize when coupling K exceeds a critical threshold. R = 0 is incoherence; R = 1 is perfect phase lock.
The descent
When the mind moves from active thought toward stillness, the signature is characteristic: beta collapses, alpha surges then quiets, theta rises slowly. Press "begin descent" to watch the transition unfold in real time.
band amplitude over time — β beta · α alpha · θ theta
Band reference
Each band is a distinct regime with its own behavioral correlates, therapeutic applications, and relationship to the others. They coexist at all times — the shift from one dominant frequency to another changes subjective experience measurably.