8,700 Studies Reviewed. 87.0% Found Biological Effects. The Evidence is Clear.
Shield Your Body
Brain & Nervous System

Human Perception of Illumination with Pulsed Ultrahigh-Frequency Electromagnetic Energy

Bioeffects Seen

Richard Felger, Mary Beck Moser · 1973

Share:

Humans can directly perceive pulsed microwave radiation as sound, proving electromagnetic fields can stimulate neural tissue without normal sensory pathways.

Plain English Summary

Summary written for general audiences

This 1973 study by Dr. Allan Frey demonstrated that humans can perceive pulsed microwave radiation as sound, even without using their ears. The research found that peak power levels and pulse characteristics determined what people heard, while average power had no effect. This discovery revealed a direct biological interaction between electromagnetic fields and the human nervous system.

Why This Matters

This groundbreaking research established what became known as the 'microwave auditory effect' or 'Frey effect,' providing some of the earliest evidence that electromagnetic fields can directly stimulate human neural tissue. The fact that people could perceive sound from pulsed microwaves without acoustic waves demonstrates that EMF can bypass normal sensory pathways and directly affect brain function. What makes this particularly relevant today is that modern wireless devices use similar pulsed, modulated signals. While your smartphone operates at much lower power levels than Frey's experimental setup, the fundamental mechanism remains the same. The study's finding that peak power matters more than average power also challenges how we typically measure EMF exposure, suggesting that current safety standards may not adequately account for pulsed signals from Wi-Fi, cell towers, and other wireless technologies.

Exposure Information

Specific exposure levels were not quantified in this study.

Cite This Study
Richard Felger, Mary Beck Moser (1973). Human Perception of Illumination with Pulsed Ultrahigh-Frequency Electromagnetic Energy.
Show BibTeX
@article{human_perception_of_illumination_with_pulsed_ultrahigh_frequency_electromagnetic_g5902,
  author = {Richard Felger and Mary Beck Moser},
  title = {Human Perception of Illumination with Pulsed Ultrahigh-Frequency Electromagnetic Energy},
  year = {1973},
  
  
}

Quick Questions About This Study

Yes, Frey's research demonstrated that people can perceive pulsed ultrahigh-frequency electromagnetic energy as audible sound, even though no actual acoustic waves are present. This occurs through direct neural stimulation.
Peak power is the primary factor determining whether people can perceive microwave-induced sound. Average power levels had no significant effect on perception, suggesting pulsed characteristics are more biologically relevant than continuous exposure levels.
The perceived pitch and timbre of microwave-induced sounds depend on the modulation characteristics of the electromagnetic signal. Different pulse patterns and modulation frequencies create different auditory perceptions in the brain.
Pulse width has a secondary effect on how people perceive microwave-induced sounds. While peak power is the primary factor, the duration of individual pulses influences the characteristics of what people hear.
Yes, the ability to perceive pulsed microwaves as sound demonstrates that electromagnetic fields can directly stimulate neural tissue in the brain, bypassing normal hearing mechanisms and proving direct EMF-nervous system interactions.