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MICROWAVE HEARING: EVIDENCE FOR THERMOACOUSTIC STIMULATION OF THE HUMAN AUDITORY SYSTEM BY PULSED MICROWAVES

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K. Foster · 1974

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Pulsed microwaves can create audible sounds directly in human tissue through thermal expansion, proving electromagnetic fields have immediate biological effects.

Plain English Summary

Summary written for general audiences

Researchers demonstrated that pulsed microwave energy can create acoustic sounds directly in water through thermal expansion. The study showed that these thermally-generated sound pulses match the intensity needed to explain the mysterious 'clicks' that people report hearing when exposed to identical microwave radiation.

Why This Matters

This groundbreaking 1974 research provided the first scientific explanation for the 'microwave hearing effect' - the phenomenon where people exposed to pulsed microwaves report hearing clicking or buzzing sounds with no external sound source. The study demonstrates that microwave energy can bypass your ears entirely, creating sounds directly within tissue through rapid thermal expansion. What this means for you: modern wireless devices don't typically use the specific pulsed patterns that create this effect, but the research reveals how electromagnetic energy can directly interact with biological systems in unexpected ways. The reality is that this thermal mechanism shows EMF can have immediate, perceptible effects on the human body - effects that were dismissed as psychological until this scientific proof emerged.

Exposure Information

Specific exposure levels were not quantified in this study.

Cite This Study
K. Foster (1974). MICROWAVE HEARING: EVIDENCE FOR THERMOACOUSTIC STIMULATION OF THE HUMAN AUDITORY SYSTEM BY PULSED MICROWAVES.
Show BibTeX
@article{microwave_hearing_evidence_for_thermoacoustic_stimulation_of_the_human_auditory__g38,
  author = {K. Foster},
  title = {MICROWAVE HEARING: EVIDENCE FOR THERMOACOUSTIC STIMULATION OF THE HUMAN AUDITORY SYSTEM BY PULSED MICROWAVES},
  year = {1974},
  
  
}

Quick Questions About This Study

Yes, research proves pulsed microwaves create audible 'clicks' through thermal expansion in tissue. The microwave energy rapidly heats water molecules, generating acoustic pressure waves that the auditory system perceives as sound without any external audio source.
Pulsed microwaves cause rapid thermal expansion in water-containing tissues. This creates pressure waves in the audible frequency range that stimulate the auditory system directly, bypassing the normal hearing process through the ears and producing phantom sounds.
The effect is scientifically proven. Researchers measured the exact pressure levels created by pulsed microwaves in water and confirmed they match the intensity needed to explain the clicks people report hearing during microwave exposure.
The clicks result from thermoacoustic stimulation - pulsed microwave energy rapidly heating tissue water, creating acoustic transients. These pressure waves directly stimulate the auditory system, producing sounds that people hear even in soundproof environments.
Most modern devices use continuous rather than pulsed transmission patterns, making the microwave hearing effect unlikely. However, the research demonstrates that electromagnetic energy can have immediate, perceptible biological effects through thermal mechanisms in human tissue.