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Brain & Nervous System124 citations

Acute exposure to pulsed 2450-MHz microwaves affects water maze learning in the rat.

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Wang, BM, Lai, H · 2000

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One hour of WiFi-frequency microwave exposure impaired spatial memory in rats at radiation levels similar to cell phone use.

Plain English Summary

Summary written for general audiences

Researchers exposed rats to pulsed microwave radiation at 2450 MHz (similar to WiFi frequency) for one hour before each training session in a water maze learning task. The microwave-exposed rats took longer to learn where a hidden platform was located and showed different swimming patterns compared to unexposed rats, indicating impaired spatial memory. This suggests that even brief microwave exposure can affect brain function and learning ability.

Why This Matters

This study provides compelling evidence that microwave radiation at frequencies we encounter daily can impair cognitive function. The 2450 MHz frequency used here is the same as WiFi and microwave ovens, and the 1.2 W/kg SAR level falls within ranges measured from cell phones during calls. What makes this research particularly significant is that the memory deficits occurred after just one hour of exposure, and the researchers carefully controlled for motor function to ensure the learning problems weren't due to physical impairment. The fact that exposed rats used different learning strategies suggests the radiation altered their brain processing in fundamental ways. This adds to a growing body of research indicating that our daily exposure to wireless radiation may be affecting our cognitive abilities in ways we're only beginning to understand.

Exposure Details

SAR
1.2 W/kg
Power Density
2 µW/m²
Source/Device
2450-MHz
Exposure Duration
1 Hour

Exposure Context

This study used 2 µW/m² for radio frequency:

This study used 1.2 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: 2 µW/m²Extreme Concern - 1,000 uW/m2FCC Limit - 10M uW/m2Effects observed in the Slight Concern rangeFCC limit is 5,000,000x 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 investigate Acute exposure to pulsed 2450-MHz microwaves affects water maze learning in the rat.

Rats were trained in six sessions to locate a submerged platform in a circular water maze. They were...

Microwave-exposed rats were slower than sham-exposed and cage control rats in learning to locate the...

These results show that acute exposure to pulsed microwaves caused a deficit in spatial "reference" memory in the rat.

Cite This Study
Wang, BM, Lai, H (2000). Acute exposure to pulsed 2450-MHz microwaves affects water maze learning in the rat. Bioelectromagnetics 21:52-56, 2000.
Show BibTeX
@article{wang_2000_acute_exposure_to_pulsed_1419,
  author = {Wang and BM and Lai and H},
  title = {Acute exposure to pulsed 2450-MHz microwaves affects water maze learning in the rat.},
  year = {2000},
  
  url = {https://pubmed.ncbi.nlm.nih.gov/10615092/},
}
PubMed: 10615092

Cited By (124 papers)

View all 124 citing papers on Semantic Scholar

Quick Questions About This Study

Yes, rats exposed to pulsed 2450 MHz microwaves for one hour before each training session showed impaired spatial memory in water maze tests. They took longer to learn platform locations and used different swimming strategies compared to unexposed rats, indicating compromised learning ability.
Research shows one hour of pulsed 2450 MHz microwave exposure before each water maze training session significantly impaired rats' learning performance. Exposed rats were slower to locate hidden platforms and showed altered swimming patterns compared to control groups.
The 2450 MHz microwave exposure affected memory but not motor function. Researchers found no significant difference in swimming speed between exposed and unexposed rats, confirming that learning deficits were due to cognitive impairment rather than physical limitations.
Rats exposed to pulsed 2450 MHz microwaves developed different swimming strategies during water maze learning. During probe trials, they spent significantly less time in the target quadrant and showed altered navigation patterns compared to unexposed control rats.
Acute exposure to pulsed 2450 MHz microwaves caused deficits in spatial reference memory in rats. The Wang and Lai 2000 study demonstrated that even brief microwave exposure before learning tasks can impair the brain's ability to form spatial memories.