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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 · 2013

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Cell phone-level radiation impaired rats' learning and memory while disrupting brain cell activity, suggesting everyday wireless exposure may affect cognitive function.

Plain English Summary

Summary written for general audiences

Researchers exposed rats to 916 MHz radiofrequency radiation (similar to cell phone signals) for 6 hours daily over 10 weeks and tested their ability to navigate a maze to find food. The exposed rats showed significantly impaired learning and memory during weeks 4-5, taking longer to complete the maze and making more errors, while brain recordings revealed disrupted neuron firing patterns throughout the study.

Why This Matters

This study adds to mounting evidence that radiofrequency radiation can disrupt cognitive function, even at power levels similar to what you encounter from cell phones and wireless devices. The 10 watts per square meter exposure level falls within the range of everyday RF exposure from multiple wireless sources in your environment. What's particularly concerning is that the researchers observed irregular brain cell firing patterns throughout the entire 10-week exposure period, even when behavioral effects weren't apparent. The temporary nature of the learning impairment (weeks 4-5) followed by apparent adaptation doesn't necessarily indicate safety. Rather, it suggests the brain may develop compensatory mechanisms that mask ongoing cellular disruption. This aligns with other research showing that chronic EMF exposure can alter brain function in ways that aren't immediately obvious but may have long-term consequences for cognitive health.

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 (2013). Effects of long-term electromagnetic field exposure on spatial learning and memory in rats. Neurol Sci 2013; 34 (2): 157-164.
Show BibTeX
@article{d_2013_effects_of_longterm_electromagnetic_105,
  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 = {2013},
  doi = {10.1007/s10072-012-0970-8},
  url = {https://link.springer.com/article/10.1007/s10072-012-0970-8},
}
DOI: 10.1007/s10072-012-0970-8

Cited By (59 papers)

View all 59 citing papers on Semantic Scholar

Quick Questions About This Study

Yes, a 2013 study found that rats exposed to 916 MHz radiation for 6 hours daily showed significantly impaired maze learning during weeks 4-5 of exposure. The exposed rats took longer to complete tasks and made more errors compared to unexposed rats.
Yes, research shows rats can adapt to chronic 916 MHz EMF exposure. While learning impairments occurred during weeks 4-5 of the 10-week study, performance returned to normal levels by weeks 6-9, suggesting biological adaptation over time.
916 MHz radiation causes hippocampal neurons to fire irregularly with more frequent spikes and shorter intervals between spikes. These disrupted firing patterns occurred throughout the entire 10-week exposure period in the study, even when behavioral effects normalized.
Weeks 4-5 represent a critical period when 916 MHz radiation exposure causes peak learning and memory impairments in rats. During this timeframe, exposed animals showed significantly longer maze completion times and higher error rates compared to controls.
No, the study found no evidence of permanent brain damage from 6 hours daily 916 MHz exposure. While rats showed temporary learning impairments and persistent changes in neuron firing patterns, behavioral performance recovered by weeks 6-9 of exposure.