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New theory proposed for hearing microwaves

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Harvey J. Hindin · 1974

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Pulsed microwaves heat tissue water fast enough to create acoustic pressure waves detectable through bone conduction.

Plain English Summary

Summary written for general audiences

Naval Medical Research Institute scientists proposed a new theory for why humans can hear pulsed microwave energy. They found that microwave pulses hitting head tissue create rapid heating and thermal expansion of tissue water, producing acoustic pressure waves that reach the ear through bone conduction. This challenges previous theories about how microwave radiation interacts with human hearing.

Why This Matters

This 1974 research reveals a fascinating and concerning mechanism by which microwave radiation directly interacts with human physiology. The fact that pulsed microwaves can create detectable acoustic effects through thermal expansion of tissue water demonstrates that these frequencies are absorbed and converted to heat in human tissue. What makes this particularly relevant today is that modern wireless devices, including cell phones and WiFi routers, emit pulsed microwave signals that operate on similar principles. While this study focused on the acoustic phenomenon, the underlying mechanism - rapid heating of tissue water - occurs whenever we're exposed to microwave radiation. The reality is that your body is constantly absorbing and converting microwave energy from wireless devices into heat, just as this study demonstrated with audible pulses.

Exposure Information

Specific exposure levels were not quantified in this study.

Cite This Study
Harvey J. Hindin (1974). New theory proposed for hearing microwaves.
Show BibTeX
@article{new_theory_proposed_for_hearing_microwaves_g6739,
  author = {Harvey J. Hindin},
  title = {New theory proposed for hearing microwaves},
  year = {1974},
  
  
}

Quick Questions About This Study

Yes, Naval Medical Research Institute scientists confirmed humans can hear pulsed microwave energy. The microwaves rapidly heat tissue water in the head, creating thermal expansion that produces acoustic pressure waves detectable through bone conduction to the ear.
Microwave pulses hitting head tissue cause rapid heating and thermal expansion of tissue water. This expansion creates pressure transients corresponding to the leading and trailing edges of each microwave pulse, which the ear detects as sound through bone conduction.
The study contrasts with a previously reported theory in Microwaves journal, though specific details aren't provided. The Naval researchers proposed thermal expansion as the mechanism rather than whatever acoustic transient effect was previously suggested.
Yes, researchers noted that proving this acoustic transient mechanism would require extensive physiological experiments. The 1974 study provided theoretical analysis showing pulsed microwave energy can produce detectable pressure transients in soft tissue containing mostly fluid.
Soft tissue containing mostly fluid responds to pulsed microwave energy by producing pressure transients. The heating effect occurs in tissue water, which undergoes thermal expansion rapid enough to create acoustic waves detectable by the human ear.