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Brain & Nervous System

Does head-only exposure to GSM-900 electromagnetic fields affect the performance of rats in spatial learning tasks?

No Effects Found

Dubreuil D, Jay T, Edeline JM. · 2002

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Rats showed no learning impairments after 45-minute exposures to GSM radiation at levels exceeding current safety limits.

Plain English Summary

Summary written for general audiences

French researchers tested whether 45-minute exposures to 900-MHz GSM cell phone radiation affected spatial learning and memory in rats. They found no differences in performance on maze tasks between rats exposed to cell phone radiation (at levels of 1 and 3.5 W/kg SAR) and unexposed control rats. This contradicts some earlier studies that suggested electromagnetic fields could impair learning abilities.

Why This Matters

This study provides important context in the ongoing debate about cell phone radiation and cognitive function. The researchers used exposure conditions that closely mimicked actual GSM phone use, including head-only exposure and realistic SAR levels. The 3.5 W/kg exposure level is significantly higher than current regulatory limits (2 W/kg in most countries), yet showed no effects on spatial learning tasks that had previously demonstrated sensitivity to EMF exposure in other studies. What this means for you is that the evidence for cognitive impairment from cell phone radiation remains mixed and inconclusive. While this single study cannot definitively rule out all cognitive effects, it does suggest that any impacts may be more subtle or require different experimental conditions than previously thought.

Exposure Details

SAR
1, 3.5 W/kg
Source/Device
900-MHz
Exposure Duration
45 minutes

Exposure Context

This study used 1, 3.5 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, 3.5 W/kgExtreme Concern - 0.1 W/kgFCC Limit - 1.6 W/kgEffects observed in the Extreme Concern range (Building Biology)FCC limit is 2 times higher than this level
A logarithmic frequency spectrum from 10 Hz to 100 GHz showing where this study's 900 MHz exposure sits relative to common EMF sources.Where This Frequency Sits on the EMF SpectrumELFVLFLF / MFHF / VHFUHFSHFmm10 Hz100 GHzThis study: 900 MHzPower lines50/60 Hz5G mm28 GHzLogarithmic scale

Study Details

This study is the first using a head-only exposure system emitting a 900-MHz GSM electromagnetic field (pulsed at 217 Hz).

The two behavioural tasks that were evaluated here have been used previously to demonstrate performa...

There were no differences among exposed, sham, and cage-control rats in the two spatial learning tas...

Cite This Study
Dubreuil D, Jay T, Edeline JM. (2002). Does head-only exposure to GSM-900 electromagnetic fields affect the performance of rats in spatial learning tasks? Behav Brain Res 129(1-2):203-210, 2002.
Show BibTeX
@article{d_2002_does_headonly_exposure_to_3008,
  author = {Dubreuil D and Jay T and Edeline JM.},
  title = {Does head-only exposure to GSM-900 electromagnetic fields affect the performance of rats in spatial learning tasks?},
  year = {2002},
  
  url = {https://pubmed.ncbi.nlm.nih.gov/11809512/},
}
PubMed: 11809512

Cited By (95 papers)

View all 95 citing papers on Semantic Scholar

Quick Questions About This Study

No, French researchers found that 45-minute exposures to 900-MHz GSM cell phone radiation did not affect spatial learning in rats. Rats exposed to radiation levels of 1 and 3.5 W/kg SAR performed identically to unexposed control rats on maze tasks, contradicting some earlier studies suggesting learning impairments.
This 2002 study found no memory impairment in rats exposed to GSM radiation at 3.5 W/kg SAR levels. Exposed rats performed the same as control groups on spatial learning tasks, suggesting that brief exposures at these power levels don't affect memory formation or recall.
This French study found no learning deficits from 900-MHz exposure, contradicting earlier research. The authors suggest methodological differences between studies may explain conflicting results, highlighting the importance of standardized protocols when studying electromagnetic field effects on cognitive function.
No, head-only exposures to GSM-900 electromagnetic fields did not affect maze performance in this rat study. Animals exposed to cell phone radiation showed no differences in spatial learning tasks compared to sham-exposed and cage-control groups, indicating no cognitive impairment from localized exposure.
Researchers tested SAR levels of 1 and 3.5 W/kg in rats exposed to 900-MHz GSM radiation for 45 minutes. Neither exposure level produced cognitive deficits in spatial learning tasks, suggesting these power densities don't impair brain function during brief exposure periods.