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Brain & Nervous System

Acute exposure to a 60 Hz magnetic field affects rats' water-maze performance

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Authors not listed · 1998

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60 Hz magnetic field exposure impaired rats' spatial memory and changed their learning strategies, suggesting power line frequencies affect brain function.

Plain English Summary

Summary written for general audiences

Researchers exposed rats to 60 Hz magnetic fields (the same frequency as household power lines) for one hour before maze training sessions. While the rats could still learn to find a hidden platform, they swam slower and showed impaired spatial memory when tested later. This suggests power frequency magnetic fields may affect brain function and memory formation.

Why This Matters

This study reveals something troubling about the 60 Hz magnetic fields that surround us daily from power lines, electrical wiring, and household appliances. The researchers used a 1 mT field strength, which is higher than typical home exposures but within range of what you might encounter near electrical panels or certain appliances. What makes this particularly significant is that the cognitive effects persisted even after exposure ended, suggesting these fields may have lasting impacts on brain function. The fact that rats used different learning strategies under EMF exposure indicates these fields don't just impair performance but actually alter how the brain processes spatial information. This adds to a growing body of evidence that power frequency EMFs can affect neurological function at exposure levels regulators have long considered safe.

Exposure Information

A logarithmic frequency spectrum from 10 Hz to 100 GHz showing where this study's 60 Hz exposure sits relative to common EMF sources.Where This Frequency Sits on the EMF SpectrumELFVLFLF / MFHF / VHFUHFSHFmm10 Hz100 GHzThis study: 60 HzCell phones~1 GHzWiFi2.4 GHz5G mm28 GHzLogarithmic scale

Specific exposure levels were not quantified in this study.

Cite This Study
Unknown (1998). Acute exposure to a 60 Hz magnetic field affects rats' water-maze performance.
Show BibTeX
@article{acute_exposure_to_a_60_hz_magnetic_field_affects_rats_water_maze_performance_ce1769,
  author = {Unknown},
  title = {Acute exposure to a 60 Hz magnetic field affects rats' water-maze performance},
  year = {1998},
  doi = {10.1002/(SICI)1521-186X(1998)19:2<117::AID-BEM10>3.0.CO;2-N},
  
}
DOI: 10.1002/(SICI)1521-186X(1998)19:2<117::AID-BEM10>3.0.CO;2-NPubMed: 9492169

Quick Questions About This Study

Yes, this study found that one-hour exposures to 60 Hz magnetic fields impaired spatial memory in rats. While they could still learn maze tasks, their memory retention was significantly reduced when tested later.
The researchers used 1 mT (1000 µT) magnetic fields, which is stronger than typical household exposures but within range of fields near electrical panels, some appliances, or power lines.
Yes, rats exposed to 60 Hz magnetic fields swam significantly slower than control animals during water maze tasks, suggesting the exposure affected their motor function or motivation.
EMF-exposed rats showed different swimming patterns and spent less time in the correct maze quadrant, indicating they used alternative behavioral strategies rather than relying on spatial memory.
Memory deficits were detected one hour after the final exposure session during probe trials, showing that 60 Hz magnetic field effects on brain function persisted beyond the exposure period.