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Long-term exposure to extremely low-frequency magnetic fields impairs spatial recognition memory in mice.

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Fu Y, Wang C, Wang J, Lei Y, Ma Y. · 2008

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Long-term exposure to power-frequency magnetic fields impaired spatial memory in mice, suggesting chronic EMF exposure may affect navigation abilities.

Plain English Summary

Summary written for general audiences

Chinese researchers exposed mice to extremely low-frequency magnetic fields (the same type emitted by power lines and household appliances) for either 7 or 25 days, then tested their spatial memory using a maze. While short-term exposure had no effect, mice exposed to 50 Hz fields for 25 days showed impaired ability to recognize new areas in the maze. This suggests that chronic exposure to power-frequency magnetic fields may interfere with spatial memory and navigation abilities.

Why This Matters

This study adds to growing evidence that ELF magnetic fields can affect brain function, specifically cognitive abilities like spatial memory that we rely on for navigation and environmental awareness. The 50 Hz frequency tested here is identical to the power grid frequency used across most of the world (60 Hz in North America), making these findings directly relevant to everyday exposures from electrical wiring, appliances, and power lines. What makes this research particularly concerning is that the cognitive impairment only appeared after chronic exposure, suggesting that the effects may be cumulative and not immediately apparent. The science demonstrates that our brains are sensitive to these fields in ways we're only beginning to understand, and this study provides another piece of evidence that long-term exposure deserves serious consideration in how we design our electrical infrastructure and living spaces.

Exposure Information

A logarithmic frequency spectrum from 10 Hz to 100 GHz showing where this study's 50 Hz exposure sits relative to common EMF sources.Where This Frequency Sits on the EMF SpectrumELFVLFLF / MFHF / VHFUHFSHFmm10 Hz100 GHzThis study: 50 HzCell phones~1 GHzWiFi2.4 GHz5G mm28 GHzLogarithmic scale

Specific exposure levels were not quantified in this study. The study examined exposure from: 25 or 50 Hz Duration: 7 or 25 days

Study Details

In the present study, we investigated the short- and long-term effects of extremely low-frequency (ELF) magnetic fields on spatial recognition memory in mice by using a two-trial recognition Y-maze that is based on the innate tendency of rodents to explore novel environments.

Mice were exposed to 25 or 50 Hz electromagnetic fields for either 7 (short term) or 25 days (long t...

The results indicated that neither short- nor long-term exposure to magnetic fields affected the loc...

Our findings suggest that ELF magnetic fields impair spatial recognition memory in the Y-maze depending on the field strength and/or duration of exposure.

Cite This Study
Fu Y, Wang C, Wang J, Lei Y, Ma Y. (2008). Long-term exposure to extremely low-frequency magnetic fields impairs spatial recognition memory in mice. Clin Exp Pharmacol Physiol. 35(7):797-800, 2008.
Show BibTeX
@article{y_2008_longterm_exposure_to_extremely_1743,
  author = {Fu Y and Wang C and Wang J and Lei Y and Ma Y.},
  title = {Long-term exposure to extremely low-frequency magnetic fields impairs spatial recognition memory in mice.},
  year = {2008},
  
  url = {https://pubmed.ncbi.nlm.nih.gov/18346171/},
}
PubMed: 18346171

Cited By (48 papers)

View all 48 citing papers on Semantic Scholar

Quick Questions About This Study

Yes, Chinese researchers found that mice exposed to 50 Hz magnetic fields (the same frequency as power lines) for 25 days showed impaired spatial recognition memory in maze tests. Short-term exposure of 7 days had no effect, suggesting chronic exposure duration matters for memory impacts.
Research demonstrates that 25-day exposure to 50 Hz extremely low-frequency magnetic fields reduced mice's ability to recognize new areas in a Y-maze test. This suggests that power-frequency EMF exposure may interfere with spatial navigation and recognition abilities over time.
A 2008 study found that 7 days of 50 Hz magnetic field exposure caused no memory effects in mice, but 25 days of exposure significantly impaired their spatial recognition memory. The research suggests memory impacts depend on both field strength and exposure duration.
Research shows that extremely low-frequency magnetic fields from sources like household appliances can impair spatial memory when exposure is chronic. Mice exposed to 50 Hz fields for 25 days showed reduced ability to navigate and recognize new environments in testing.
Studies found that 50 Hz magnetic fields specifically caused spatial recognition memory impairment in mice after 25 days of exposure, while 25 Hz fields were also tested. The 50 Hz frequency matches that emitted by power lines and many electrical appliances.