A frequency value names how often a process repeats. The same number can describe a neural rhythm, an acoustic pulse, or an applied electric or magnetic field. It can also describe a microwave signal’s modulation envelope or a statistical recurrence. Those processes use different carriers and reach their receivers through different paths. Numerical overlap supplies a research lead; an effect requires a coupling mechanism.
This register separates effects that frequency literature often combines. Each entry follows the complete chain:
source → carrier and waveform → coupling path → dose → receiver → measured effectEvidence Labels
Measured identifies an observed carrier and an observed response. Both sides of the effect are available in the record.
Supported identifies an effect established through controlled studies. Its magnitude and the conditions that govern it remain under study.
Unresolved identifies an early result or a testable correspondence without reliable causal replication. The proposed relation remains a research question.
Historical claim identifies an assertion important to the subject’s genealogy. Its source record is too weak to establish the asserted effect.
Endogenous Neural Rhythms
Electroencephalography, or EEG, records electrical activity generated by neural populations. Its frequency bands describe the receiver’s activity. An external signal at the same rate still needs a path that changes those populations.
Delta, approximately 0.5–4 Hz — measured. Slow-wave sleep commonly produces high-amplitude delta activity. Delta also appears in pathology, development, attention, and task-related coordination. The surrounding activity determines its meaning; delta alone does not establish unconsciousness.
Theta, approximately 4–8 Hz — measured. Theta participates in memory, navigation, and cognitive control, as well as drowsy and meditative states. Its function depends on the source region, task, phase relations, and species.
Alpha, approximately 8–12 Hz — measured. Relaxed wakefulness with closed eyes often produces prominent alpha activity. Alpha also participates in sensory inhibition and the gating of attention. These functions prevent a universal equation between alpha and calm.
Beta, approximately 13–30 Hz — measured. Beta participates in motor control, prediction, active cognition, and the maintenance of the current sensorimotor state. Calling it “the anxiety frequency” removes most of those functions from the account.
Gamma, conventionally above 30 Hz — measured. Gamma participates in local processing and coordination. Muscle activity and other artifacts can contaminate scalp measurements. Several conscious processes correlate with gamma, but the band identifies neither consciousness itself nor spiritual rank.
The bands also interact. Coupling between different frequencies often carries more information than the power measured within one band. The Human Chord develops these relations within the whole instrument.
Auditory Rhythm and Sound
Auditory steady-state response — measured. Repeated sound can produce neural responses locked to the stimulation’s phase. Responses appear at the stimulation rate and its harmonics. This effect shows the nervous system tracking a rhythm.
Rhythmic drumming — supported as state induction. Controlled studies find changes in subjective state and temporal experience during repetitive drumming. A 2026 EEG study associated stronger theta-range neural tracking with stronger drumming-induced altered experience. Rhythm participates alongside duration, attention, expectation, imagery, and the participant’s susceptibility. The complete induction includes all these conditions.
Binaural beats — mixed and protocol-dependent. Slightly different tones presented to the two ears produce a perceived beat. Reviews find inconsistent evidence that this beat reliably entrains its intended EEG band. Binaural audio can nevertheless contribute to relaxation and state training within a larger protocol.
Reference pitch claims — unresolved and generally unsupported. Music tuned around A=432 Hz physically differs from music tuned around A=440 Hz. Universal healing or harmful effects have not been established. Composition, intervals, timbre, loudness, and performance usually explain more than the reference pitch alone. Expectation, memory, and context also shape the listener’s response.
Cardiovascular Resonance
Approximately 0.1 Hz cardiorespiratory resonance — supported. Slow breathing near an individual’s resonance frequency can increase respiratory sinus arrhythmia, heart-rate variability, and baroreflex gain. The breathing rate is often around 4.5–6.5 breaths per minute. These changes concern coordination among breathing, heart rhythm, and blood-pressure regulation.
The oscillators, feedback delay, intervention, and response are defined. That chain establishes a real resonance. Relabeling it as Schumann entrainment loses the mechanism that produces the result. Similar numerical rates can belong to different carriers.
Electric and Magnetic Stimulation
Transcranial magnetic stimulation — established intervention class. A rapidly changing magnetic field induces electric current in neural tissue. The target, pulse shape, intensity, repetition rate, coil geometry, and participant’s state determine the effect.
Transcranial alternating-current stimulation — active research. Weak alternating current applied through the scalp can modulate neural activity under some conditions. Effects are generally small and depend on the participant’s state. Peripheral sensory responses can confound the apparent neural effect.
Power-frequency magnetic fields at 50/60 Hz — measured exposure. Health effects depend on dose and the outcome under study. The International Agency for Research on Cancer classifies extremely low-frequency magnetic fields as possibly carcinogenic. That classification rests chiefly on limited evidence concerning childhood leukemia during chronic elevated exposure. It neither makes the frequency itself poisonous nor gives every grid-powered environment the same effect.
Radiofrequency heating — established. Sufficient radiofrequency energy heats tissue. Research on nonthermal biological effects remains active and contested. Its interpretation depends on dosimetry, modulation, replication, and exposure conditions. Dosimetry specifies how much energy reaches the exposed system.
Microwave auditory effect — measured. Pulsed radiofrequency energy can produce perceived clicks or sounds. It generates thermoelastic pressure waves in tissue: brief heating produces expansion and a pressure wave. Pulse energy, duration, repetition, geometry, and safety limits govern the effect. Carrier frequency alone cannot specify it.
Schumann Resonances
The Earth–ionosphere cavity supports electromagnetic resonances with a fundamental near 7.8 Hz and variable higher modes. These resonances are measured. Their numerical overlap with EEG bands is also available through arithmetic.
Direct entrainment of human neural activity by ambient Schumann fields remains unresolved. The ambient fields are extremely weak. A receiver or amplification path must bridge the gap between that field strength and a neural response. An effect found during controlled exposure belongs to that exposure. It does not establish that the natural ambient signal drives the same effect.
Historical Puharich–Beck materials carry claims that 7.83 Hz guarantees wellbeing. They assign depression to frequencies immediately below it and agitation to frequencies immediately above it. Those assertions remain historical claims. They lack the replicated clinical dose–response record needed to establish those fixed effects. Schumann Resonance carries the fuller treatment.
Geomagnetic and Sidereal Claims
Geomagnetic sensitivity — active research. Controlled studies have reported human neural responses to rotated magnetic fields at the Earth’s field strength. Replication, variation among individuals, and the responses’ functional significance remain open.
Geomagnetic correlations — unresolved. Studies report associations among geomagnetic activity, cardiovascular outcomes, mood, sleep, and other variables. Solar, seasonal, environmental, and analytical covariates complicate causal interpretation. These variables can change alongside the proposed cause and response.
Local sidereal time and anomalous cognition — unresolved. Spottiswoode reported variation in free-response anomalous-cognition effect size by local sidereal time. That time tracks the observer’s orientation relative to the stars. The reported relation concerns timing rather than an extremely low-frequency exposure. It remains in the anomaly ledger until prospective replication under a fixed analysis.
Removed from the Evidence Layer
Several claims previously presented as documented lack the record this register requires:
- fixed psychological effects at 6.00, 6.26, 6.67, 10.8, or 11 Hz;
- the Schumann fundamental as a proven baseline of human wellbeing;
- 60 Hz as a demonstrated displacement of a biological 7.83 Hz carrier;
- a direct one-to-one map from EEG bands to Gateway Focus levels;
- the claim that the Soviet Woodpecker produced riotous behavior through a particular ELF tone;
- the claim that telecommunications rollouts caused influenza, SARS, or COVID-19;
- a galactic alignment proven to modulate a consciousness channel.
Some remain research leads. Classification as a “documented frequency effect” requires a reproducible chain from carrier through dose to response. Repetition of a number cannot supply that missing chain.
Submission Standard
A new entry should specify each part of the exposure and its result:
- source and carrier;
- carrier frequency and modulation or pulse structure;
- amplitude, field strength, or sound-pressure level;
- duration, geometry, and distance;
- receiver and baseline state;
- controls and blinding;
- measured outcome;
- replication status;
- adverse effects;
- the smallest claim the evidence actually supports.
Frequency describes a rate, while information requires a pattern carried through variation. A receiver gives that pattern meaning. An effect begins when the carrier couples to the receiver and changes it. The complete chain identifies what changed and how the signal reached it.
References
Frey, Allan H. “Human Auditory System Response to Modulated Electromagnetic Energy.” Journal of Applied Physiology 17, no. 4 (1962): 689–692. https://doi.org/10.1152/jappl.1962.17.4.689.
Gordon, Yaniv, et al. “Neural Tracking at Theta Predicts Drumming-Induced Altered States of Consciousness.” Scientific Reports (2026). https://doi.org/10.1038/s41598-026-37700-x.
Ingendoh, Roman M., et al. “Binaural Beats to Entrain the Brain? A Systematic Review.” PLOS ONE 18, no. 5 (2023): e0286023. https://doi.org/10.1371/journal.pone.0286023.
International Agency for Research on Cancer. Non-Ionizing Radiation, Part 1: Static and Extremely Low-Frequency Electric and Magnetic Fields. IARC Monographs, vol. 80. Lyon, 2002.
Lehrer, Paul M., and Richard Gevirtz. “Heart Rate Variability Biofeedback: How and Why Does It Work?” Frontiers in Psychology 5 (2014): 756. https://doi.org/10.3389/fpsyg.2014.00756.
Thut, Gregor, and Carlo Miniussi. “New Insights into Rhythmic Brain Activity from TMS–EEG Studies.” Trends in Cognitive Sciences 13, no. 4 (2009): 182–189. https://doi.org/10.1016/j.tics.2009.01.004.
Wang, Connie X., et al. “Transduction of the Geomagnetic Field as Evidenced from Alpha-Band Activity in the Human Brain.” eNeuro 6, no. 2 (2019). https://doi.org/10.1523/ENEURO.0483-18.2019.