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Acute exposure to a 50 Hz magnetic field impairs consolidation of spatial memory in rats.

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Jadidi M, Firoozabadi SM, Rashidy-Pour A, Sajadi AA, Sadeghi H, Taherian AA. · 2007

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Twenty minutes of magnetic field exposure can disrupt memory formation in the brain, suggesting EMF may interfere with learning processes.

Plain English Summary

Summary written for general audiences

Researchers exposed rats to 50 Hz magnetic fields (household electricity frequency) immediately after learning a maze. An 8 milliTesla field for 20 minutes disrupted memory formation when applied right after learning, suggesting magnetic fields can interfere with how brains consolidate new memories.

Why This Matters

This research demonstrates a concerning mechanism by which EMF exposure might affect cognitive function. The science shows that magnetic fields can disrupt memory consolidation - the critical process by which short-term memories become permanently stored. What makes this particularly relevant is the timing sensitivity: exposure immediately after learning caused problems, but exposure before testing did not. This suggests EMF interferes with active memory processing rather than simply impairing performance. The 8 mT exposure level used here is higher than typical household exposures (which range from 0.1 to 1 mT near appliances), but the finding that even brief exposure can disrupt fundamental brain processes raises important questions about chronic, lower-level exposures we encounter daily.

Exposure Details

Magnetic Field
2, 8 mG
Source/Device
50 Hz
Exposure Duration
20 min

Exposure Context

This study used 2, 8 mG for magnetic fields:

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: 2, 8 mGExtreme Concern - 5 mGFCC Limit - 2,000 mGEffects observed in the Severe Concern rangeFCC limit is 1,000x higher than this level
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

Study Details

This study was planned to evaluate the effect of an exposure to magnetic fields on consolidation and retrieval of hippocampus dependent spatial memory using a water maze.

In Experiments 1 and 2, rats were trained in a hidden version (spatial) of water maze task with two ...

Exposure to a 50 Hz 8 mT, but not 2 mT magnetic fields for 20 min immediately after training impaire...

These findings indicate that acute exposure to a 50 Hz magnetic field at 8 mT for short time can impair consolidation of spatial memory.

Cite This Study
Jadidi M, Firoozabadi SM, Rashidy-Pour A, Sajadi AA, Sadeghi H, Taherian AA. (2007). Acute exposure to a 50 Hz magnetic field impairs consolidation of spatial memory in rats. Neurobiol Learn Mem. 88(4):387-392, 2007.
Show BibTeX
@article{m_2007_acute_exposure_to_a_656,
  author = {Jadidi M and Firoozabadi SM and Rashidy-Pour A and Sajadi AA and Sadeghi H and Taherian AA.},
  title = {Acute exposure to a 50 Hz magnetic field impairs consolidation of spatial memory in rats.},
  year = {2007},
  
  url = {https://pubmed.ncbi.nlm.nih.gov/17768075/},
}
PubMed: 17768075

Cited By (43 papers)

Quick Questions About This Study

Research shows 50 Hz magnetic fields from household electricity can impair memory consolidation in laboratory studies. Rats exposed to strong magnetic fields immediately after learning showed disrupted memory formation, suggesting the timing of exposure matters for brain function.
Studies demonstrate that magnetic field exposure can interfere with how the brain processes and stores new memories. Research found that 50 Hz magnetic fields disrupted spatial memory consolidation when applied immediately after learning tasks in animal studies.
Laboratory research indicates 50 Hz magnetic fields can impair memory consolidation under specific conditions. The effect depends on field strength and timing - disruption occurred only with strong fields applied immediately after learning, not before memory testing.
Power line frequency magnetic fields may interfere with memory formation based on animal research. Studies show 50 Hz fields can disrupt spatial memory consolidation when exposure occurs during the critical period immediately after learning new information.
Electromagnetic field exposure can impact the brain's ability to consolidate new memories according to research findings. Studies show 50 Hz magnetic fields interfere with memory formation when applied at specific strengths immediately after learning occurs.