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Low-frequency pulsed electromagnetic field exposure can alter neuroprocessing in humans

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Robertson JA et al · 2009

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Low-intensity, low-frequency magnetic field exposure can produce observable neuromodulatory effects on human pain processing that are detectable through functional brain imaging.

Plain English Summary

Summary written for general audiences

This fMRI study examined how exposure to low-frequency pulsed electromagnetic fields (DC to 300 Hz) affects pain processing in the human brain. The researchers found significant differences in brain activation patterns between exposed and sham-exposed groups in regions including the insula, anterior cingulate, and hippocampus/caudate, suggesting that magnetic fields can modulate neural responses to acute thermal pain in humans.

Why This Matters

The study builds on prior observations of magnetic field effects on pain sensitivity in animal models by providing direct neuroimaging evidence in humans. The authors suggest that the mechanism for human magnetoreception in response to these fields may differ from the navigation and orientation mechanisms studied in animals.

Exposure Information

A logarithmic frequency spectrum from 10 Hz to 100 GHz showing where this study's 15 Hz exposure sits relative to common EMF sources.Where This Frequency Sits on the EMF SpectrumELFVLFLF / MFHF / VHFUHFSHFmm10 Hz100 GHzThis study: 15 HzPower lines50/60 HzCell phones~1 GHzWiFi2.4 GHz5G mm28 GHzLogarithmic scale

Specific exposure levels were not quantified in this study.

Cite This Study
Robertson JA et al (2009). Low-frequency pulsed electromagnetic field exposure can alter neuroprocessing in humans.
Show BibTeX
@article{low_frequency_pulsed_electromagnetic_field_exposure_can_alter_neuroprocessing_in_humans_ce2171,
  author = {Robertson JA et al},
  title = {Low-frequency pulsed electromagnetic field exposure can alter neuroprocessing in humans},
  year = {2009},
  doi = {10.1002/bem.20459},
  
}
DOI: 10.1002/bem.20459PubMed: 19656823

Quick Questions About This Study

Yes, this study found that 8-hour exposure to 15 Hz pulsed electromagnetic fields at 1.8 mT strength caused bone cells to release chemical signals that dramatically affected neighboring blood vessel cells, increasing their growth rate by 54 times.
The researchers determined it wasn't VEGF-A, the most common blood vessel growth factor. They discovered the bone cells released some other unknown soluble chemical messenger after electromagnetic field exposure, but they haven't identified what this mystery substance is yet.
The study used 8-hour continuous exposure to 15 Hz pulsed electromagnetic fields. This duration was sufficient to cause bone cells to begin releasing chemical signals that dramatically increased blood vessel cell proliferation when tested in laboratory conditions.
No, the effect was one-directional. When blood vessel cells were exposed to the same 15 Hz electromagnetic fields, their secreted chemicals did not affect bone cell growth, showing that only bone cells responded by releasing the mystery growth-promoting substance.
Yes, 1.8 millitesla is quite strong compared to typical environmental EMF exposure. For comparison, this is roughly 36,000 times stronger than Earth's magnetic field and much higher than typical household electromagnetic field levels from appliances or power lines.