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Reduced exposure to microwave radiation by rats: frequency specific effects.

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D'Andrea JA, DeWitt JR, Portuguez LM, Gandhi OP. · 1988

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Rats instinctively avoided microwave radiation at levels comparable to cell phone limits, suggesting biological detection of harmful effects.

Plain English Summary

Summary written for general audiences

Rats given the choice consistently moved away from microwave radiation when it was turned on. They avoided certain frequencies more strongly than others, demonstrating that animals can sense and actively avoid microwave exposure at levels as low as 2.1-2.8 watts per kilogram.

Why This Matters

This research provides compelling evidence that microwave radiation produces detectable biological effects that animals instinctively avoid. The fact that rats could sense and behaviorally respond to radiation at SAR levels as low as 2.1 W/kg is significant because current cell phones operate at SAR limits of 1.6 W/kg in the US and 2.0 W/kg in Europe. The frequency-specific responses align with known physics about how different frequencies create thermal hotspots in biological tissue.

What makes this study particularly important is that it demonstrates biological detection of EMF effects without requiring the animals to show overt signs of harm. The rats' avoidance behavior suggests these exposures were creating uncomfortable or potentially harmful conditions that their natural instincts recognized. This type of behavioral evidence complements the growing body of research showing biological effects from wireless radiation at levels regulators currently consider safe.

Exposure Details

SAR
1, 2, 6 and 10 W/kg
Source/Device
360-MHz, 700-MHz or 2450-MHz

Exposure Context

This study used 1, 2, 6 and 10 W/kg for SAR (device absorption):

Building Biology guidelines are practitioner-based limits from real-world assessments. BioInitiative Report recommendations are based on peer-reviewed science. Check Your Exposure to compare your own measurements.

Where This Falls on the Concern Scale

Study Exposure Level in ContextStudy Exposure Level in ContextThis study: 1, 2, 6 and 10 W/kgExtreme Concern - 0.1 W/kgFCC Limit - 1.6 W/kgEffects observed in the Extreme Concern rangeFCC limit is 2x higher than this level
A logarithmic frequency spectrum from 10 Hz to 100 GHz showing where this study's 360 MHz - 2.45 GHz exposure sits relative to common EMF sources.Where This Frequency Sits on the EMF SpectrumELFVLFLF / MFHF / VHFUHFSHFmm10 Hz100 GHzThis study: 360 MHz - 2.45 GHzPower lines50/60 HzWiFi2.4 GHz5G mm28 GHzLogarithmic scale

Study Details

Two experiments were conducted to determine if hotspot formation in the body and tail of the rat, which is radiation frequency specific, would have behavioral consequences.

In the first experiment rats were placed in a plexiglas cage one side of which, when occupied by the...

A significant reduction in occupancy of the preferred side of the cage, and hence, microwaves subseq...

Cite This Study
D'Andrea JA, DeWitt JR, Portuguez LM, Gandhi OP. (1988). Reduced exposure to microwave radiation by rats: frequency specific effects. Prog Clin Biol Res. 257:289-308, 1988.
Show BibTeX
@article{ja_1988_reduced_exposure_to_microwave_918,
  author = {D'Andrea JA and DeWitt JR and Portuguez LM and Gandhi OP.},
  title = {Reduced exposure to microwave radiation by rats: frequency specific effects.},
  year = {1988},
  
  url = {https://pubmed.ncbi.nlm.nih.gov/3344273/},
}
PubMed: 3344273

Cited By (9 papers)

Quick Questions About This Study

Yes, animals can sense microwave radiation. A 1988 study found that rats consistently moved away from microwave exposure when it was turned on, demonstrating they can detect and actively avoid these electromagnetic fields at relatively low power levels.
Research shows animals avoid certain microwave frequencies used in wireless technology. Rats in laboratory studies moved away from 2450-MHz radiation (used in WiFi) and 360-MHz signals, but showed less avoidance of 700-MHz frequencies used in some cell networks.
Animals begin avoiding microwave radiation at power levels between 2.1 and 2.8 watts per kilogram of body weight. This suggests biological detection mechanisms activate at exposure levels that don't cause obvious tissue heating or immediate harm.
Microwave radiation appears to trigger avoidance behaviors in animals, suggesting biological detection of these fields. Laboratory rats consistently moved away from microwave exposure across multiple frequencies, indicating these electromagnetic fields produce measurable behavioral responses even at moderate power levels.
Microwave exposure causes animals to change their location and movement patterns. Rats exposed to microwave radiation showed significant reductions in time spent in areas with active electromagnetic fields, particularly avoiding 360-MHz and 2450-MHz frequencies.