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Effects of long-term electromagnetic field exposure on spatial learning and memory in rats.

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Hao D, Yang L, Chen S, Tong J, Tian Y, Su B, Wu S, Zeng Y. · 2012

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Cell phone radiation temporarily impaired rats' learning and memory while disrupting brain cell firing patterns in the hippocampus.

Plain English Summary

Summary written for general audiences

Researchers exposed rats to cell phone radiation (916 MHz) for six hours daily over ten weeks. During weeks 4-5, exposed rats showed impaired learning and memory, taking longer to navigate mazes and making more errors than unexposed rats, indicating potential cognitive effects.

Why This Matters

This study provides compelling evidence that radiofrequency radiation can disrupt cognitive function, even at power levels similar to those emitted by cell phones. The 10 watts per square meter exposure used here falls within the range of emissions from mobile devices during calls. What's particularly significant is that the researchers documented both behavioral changes and direct neurological effects in the hippocampus, the brain's memory center. The temporary nature of the impairment during weeks 4-5, followed by apparent adaptation, raises important questions about whether the brain truly adapts or simply develops compensatory mechanisms while underlying damage persists. This research adds to a growing body of evidence suggesting that chronic EMF exposure may affect cognitive performance, particularly concerning given our increasing reliance on wireless devices.

Exposure Details

Power Density
1 µW/m²
Source/Device
916 MHz
Exposure Duration
6 h a day, 5 days a week, 10 weeks.

Exposure Context

This study used 1 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: 1 µW/m²Extreme Concern - 1,000 uW/m2FCC Limit - 10M uW/m2Effects observed in the Slight Concern rangeFCC limit is 10,000,000x higher than this level
A logarithmic frequency spectrum from 10 Hz to 100 GHz showing where this study's 916 MHz exposure sits relative to common EMF sources.Where This Frequency Sits on the EMF SpectrumELFVLFLF / MFHF / VHFUHFSHFmm10 Hz100 GHzThis study: 916 MHzPower lines50/60 Hz5G mm28 GHzLogarithmic scale

Study Details

This paper investigated the effect of electromagnetic field on spatial learning and memory in rats.

32 trained Wistar rats were divided into two groups: exposure group and control group. The exposure ...

It can be seen that during the weeks 4-5 of the experiment, the average completion time and error ra...

It indicates that the 916 MHz EMF influence learning and memory in rats to some extent in a period during exposure, and the rats can adapt to long-term EMF exposure.

Cite This Study
Hao D, Yang L, Chen S, Tong J, Tian Y, Su B, Wu S, Zeng Y. (2012). Effects of long-term electromagnetic field exposure on spatial learning and memory in rats. Neurol Sci. 2012 Feb 24.
Show BibTeX
@article{d_2012_effects_of_longterm_electromagnetic_1014,
  author = {Hao D and Yang L and Chen S and Tong J and Tian Y and Su B and Wu S and Zeng Y.},
  title = {Effects of long-term electromagnetic field exposure on spatial learning and memory in rats.},
  year = {2012},
  
  url = {https://pubmed.ncbi.nlm.nih.gov/22362331/},
}
PubMed: 22362331

Cited By (59 papers)

View all 59 citing papers on Semantic Scholar

Quick Questions About This Study

Yes, rats exposed to 916 MHz radiation for six hours daily showed impaired maze learning during weeks 4-5 of a ten-week study. They took longer to navigate mazes and made more errors compared to unexposed rats, indicating cognitive effects from this specific frequency.
Yes, rats showed adaptation to long-term 916 MHz EMF exposure. While cognitive impairments occurred during weeks 4-5, learning performance returned to normal levels during weeks 6-9, suggesting the brain can adapt to chronic electromagnetic field exposure over time.
916 MHz radiation caused hippocampal neurons to show irregular firing patterns and increased spike activity with shorter intervals between spikes throughout the entire ten-week exposure period, indicating persistent changes in brain cell electrical activity.
Six hours daily exposure to 916 MHz radiation caused temporary memory problems in rats during weeks 4-5, including increased completion times and error rates in spatial memory tasks. These effects were not present during early or late exposure periods.
No, 916 MHz exposure did not cause permanent cognitive damage in this rat study. While learning and memory impairments occurred during weeks 4-5 of exposure, cognitive performance returned to normal levels, suggesting the effects were temporary rather than permanent.