Note: This study found no significant biological effects under its experimental conditions. We include all studies for scientific completeness.
Disturbance of the magnetic field did not affect spatial memory.
Li Y, Zhang C, Song T. · 2014
View Original AbstractThis 90-day study found no memory impairment in rats exposed to 100 microT magnetic fields, levels similar to close appliance exposure.
Plain English Summary
Researchers exposed rats to 50 Hz magnetic fields at 100 microT (similar to levels near some electrical appliances) for 90 days while testing their spatial memory and learning abilities using a water maze. The magnetic field exposure did not impair the rats' ability to learn or remember spatial tasks, nor did it interfere with improvements from previous training. This suggests that this level of extremely low frequency magnetic field exposure does not harm basic learning and memory functions.
Why This Matters
This study provides reassuring evidence that everyday levels of extremely low frequency magnetic fields don't appear to disrupt basic cognitive functions like spatial memory. The 100 microT exposure level is comparable to what you might encounter standing very close to some household appliances or electrical equipment, though it's higher than typical background levels in most homes (which are usually under 1 microT). What makes this research particularly valuable is the 90-day exposure duration, which is longer than many similar studies and more relevant to real-world chronic exposure scenarios. While this is just one study in rats, it adds to a mixed body of research on ELF magnetic fields and brain function. The reality is that the evidence for cognitive effects from ELF fields remains inconclusive overall, with studies showing varying results depending on exposure levels, duration, and specific cognitive tasks tested.
Exposure Details
- Magnetic Field
- 0.1 mT
- Source/Device
- 50 Hz
- Exposure Duration
- 90 day
Exposure Context
This study used 0.1 mT for magnetic fields:
- 5Kx above the Building Biology guideline of 0.2 mG
- 1Kx above the BioInitiative Report recommendation of 1 mG
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 Details
This study aims to evaluate the effects of previous training and ELF-MF exposure on learning and memory using the Morris water maze (MWM).
Sprague-Dawley rats were subjected to MWM training, ELF-MF exposure (50 Hz, 100 microT), or ELF-MF e...
The data show that the rats exposed to training and ELF-MF with training performed better on spatial...
Show BibTeX
@article{y_2014_disturbance_of_the_magnetic_2829,
author = {Li Y and Zhang C and Song T.},
title = {Disturbance of the magnetic field did not affect spatial memory.},
year = {2014},
url = {https://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.445.1360&rep=rep1&type=pdf},
}