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Simultaneous response of brain electrical activity (EEG) and cerebral circulation (REG) to microwave exposure in rats.

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Thuroczy G, Kubinyi G, Bodo M, Bakos J, Szabo LD, · 1994

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Microwave radiation altered rat brain activity and blood flow at non-heating levels comparable to everyday WiFi and cell phone exposures.

Plain English Summary

Summary written for general audiences

Researchers exposed rats to 2.45 GHz microwave radiation (similar to WiFi frequencies) and monitored brain activity and blood flow. Even low-power exposures altered brain wave patterns and increased blood circulation to the brain, showing the brain responds to microwave radiation below heating levels.

Why This Matters

This study provides compelling evidence that microwave radiation affects brain function at power levels well below current safety limits. The researchers found measurable changes in brain electrical activity and blood flow at exposures as low as 10 mW/cm² - levels comparable to what you might experience from a WiFi router or cell phone. What makes this particularly significant is that these effects occurred without tissue heating, challenging the industry's long-held position that only thermal effects matter. The fact that modulated signals produced different brain wave changes than continuous wave signals also suggests our regulatory approach, which ignores modulation patterns, may be inadequate. While this is animal research, the brain's electrical and vascular responses are fundamental biological processes that translate across species.

Exposure Details

Power Density
10, 30 µW/m²
Source/Device
2.45 GHz
Exposure Duration
10 Minutes

Exposure Context

This study used 10, 30 µW/m² for radio frequency:

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: 10, 30 µW/m²Extreme Concern - 1,000 uW/m2FCC Limit - 10M uW/m2Effects observed in the Severe Concern rangeFCC limit is 1,000,000x higher than this level
A logarithmic frequency spectrum from 10 Hz to 100 GHz showing where this study's 2.45 GHz exposure sits relative to common EMF sources.Where This Frequency Sits on the EMF SpectrumELFVLFLF / MFHF / VHFUHFSHFmm10 Hz100 GHzThis study: 2.45 GHzPower lines50/60 Hz5G mm28 GHzLogarithmic scale

Study Details

The aim of this study is to observe Simultaneous response of brain electrical activity (EEG) and cerebral circulation (REG) to microwave exposure in rats.

In two series of experiments on anaesthetized rats (N = 40) (i) before and after 10 min, whole body ...

The total power of EEG spectra increased after whole body 30 mW/cm2 2.45 GHz CW exposure for 10 min....

Cite This Study
Thuroczy G, Kubinyi G, Bodo M, Bakos J, Szabo LD, (1994). Simultaneous response of brain electrical activity (EEG) and cerebral circulation (REG) to microwave exposure in rats. Rev Environ Health 10(2):135-148, 1994.
Show BibTeX
@article{g_1994_simultaneous_response_of_brain_1360,
  author = {Thuroczy G and Kubinyi G and Bodo M and Bakos J and Szabo LD and},
  title = {Simultaneous response of brain electrical activity (EEG) and cerebral circulation (REG) to microwave exposure in rats.},
  year = {1994},
  
  url = {https://pubmed.ncbi.nlm.nih.gov/8047672/},
}
PubMed: 8047672

Cited By (53 papers)

View all 53 citing papers on Semantic Scholar

Quick Questions About This Study

Yes, research shows 2.45 GHz microwave radiation alters brain wave patterns in rats. A 1994 study found that 30 mW/cm² exposure for 10 minutes increased total brain electrical activity, while lower power levels specifically increased blood flow to the brain without heating effects.
Yes, 2.45 GHz radiation (the same frequency as WiFi) can increase cerebral blood flow. Research on rats showed that even low-power microwave exposure at 10 mW/cm² increased blood circulation to the brain, demonstrating biological effects below thermal heating levels.
Ten minutes of 2.45 GHz microwave exposure at 30 mW/cm² increases total brain electrical activity in rats. The study found significant changes in EEG spectra, indicating that brief microwave exposures can alter brain function even at non-thermal power levels.
Yes, amplitude modulated 4 GHz radiation at 16 Hz increases beta brain wave activity. Research found that modulated microwave exposure at 8.4 mW/g SAR specifically enhanced beta waves (14.5-30 Hz) in rats, showing frequency-specific effects on brain electrical patterns.
Brain effects from 2.45 GHz radiation occur at 10 mW/cm² and above. Research shows increased cerebral blood flow at 10 mW/cm², while 30 mW/cm² exposure alters brain wave patterns, demonstrating that biological effects happen at relatively low power levels.