Brainwaves
Delta (High)
3.50 Hz
Cosmic Octave Color
Derived visible color (609 nm)
Display swatch #ed9e35
Octave-shifted: 28.00 Hz (+3 octaves)
EstablishedBrainwave Band
Evidence Level
Established
Source Count
1
Last Reviewed
March 23, 2026
Directly measured, standardized, or well-supported in mainstream scientific or technical literature.
This entry summarizes recognized frequency bands, but subjective states vary across people and contexts. The atlas is not making medical or diagnostic claims.
Review the evidence modelUpper delta range, transitioning toward theta. Deep sleep with occasional dream-like imagery.
Wavelength
98.00 m
Claim Type
Brainwave Band
Cosmic Octave Color
Derived visible color (609 nm) · #ed9e35
Source
Neuroscience / EEG research
Sources
Neuroscience and EEG Research
14 atlas references
Used for brainwave frequency bands and broad EEG ranges, rather than for mystical or therapeutic certainty.
Neuroscience / EEG research.
Octave Ladder
Every audible octave of this frequency — the same tone, higher and lower.
Nearby in the Atlas
Entries within ±35 cents of this tone when reduced to the same octave — candidates for pairing or comparison.
111 Hz — Megalithic ResonanceHealing Frequencies
111.00 Hz-15.5¢
Venus Orbit (Cosmic Octave)Planetary Cycles
221.23 Hz-21.5¢
Paiste Planetary Gong — VenusInstrument Resonances
221.23 Hz-21.5¢
Moon Sidereal Month (Cosmic Octave)Cosmic Cycles
227.43 Hz+26.3¢
Red Light (620 nm)EM Spectrum
484.0 THz-30.4¢
A0Musical Frequencies
27.50 Hz-31.2¢
brainwavedelta