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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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Magnetic field exposure during memory formation can impair long-term recall, suggesting our brains are vulnerable during learning.

Plain English Summary

Summary written for general audiences

Researchers exposed rats to 50 Hz magnetic fields (power line frequency) for 20 minutes after they learned a memory task. High-intensity exposure (8 milliTesla) impaired their ability to remember the task 48 hours later, suggesting magnetic fields can disrupt how the brain stores new memories.

Why This Matters

This study provides compelling evidence that magnetic field exposure can interfere with one of our brain's most fundamental processes: forming lasting memories. The 8 milliTesla exposure level used here is substantially higher than typical household exposures (which range from 0.01 to 0.2 milliTesla), but it's within the range found near high-voltage power lines or certain industrial equipment. What makes this research particularly significant is its focus on memory consolidation, the critical window when the brain transfers information from temporary to permanent storage. The science demonstrates that timing matters crucially - the magnetic field only caused problems when applied during this vulnerable consolidation period, not during memory retrieval. This finding aligns with growing research showing that EMF exposure can affect neurological function, and it raises important questions about chronic exposure effects on learning and memory formation in humans.

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_262,
  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://www.sciencedirect.com/science/article/abs/pii/S107474270700113X},
}

Quick Questions About This Study

Yes, a 2007 study found that 50 Hz magnetic fields at 8 milliTesla significantly impaired spatial memory consolidation in rats. Twenty minutes of exposure immediately after learning a maze task reduced their ability to remember it 48 hours later, suggesting power line frequencies can disrupt memory formation.
Research shows 8 milliTesla magnetic fields at 50 Hz impair memory consolidation, while 2 milliTesla fields do not. The study found this threshold effect when rats were exposed for 20 minutes immediately after learning, indicating stronger magnetic fields pose greater risks to memory processing.
Yes, timing is crucial for 50 Hz magnetic field effects on memory. Exposure immediately after learning impaired memory consolidation, but the same exposure shortly before memory testing had no effect. This suggests magnetic fields specifically disrupt the brain's process of storing new memories.
Research demonstrates that 50 Hz magnetic fields (power line frequency) can impair how the brain consolidates spatial memories. A study found 8 milliTesla exposure for 20 minutes after learning disrupted memory storage, suggesting everyday power line EMF may interfere with memory formation processes.
The study found 50 Hz magnetic fields specifically impaired spatial memory tasks but not cued memory tasks in rats. This suggests power line frequency EMF selectively affects certain types of learning and memory processes, with spatial navigation being more vulnerable than simple cue-response learning.