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Alterations of human electroencephalographic activity caused by multiple extremely low frequency magnetic field exposures

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Cvetkovic D, Cosic I. · 2009

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Magnetic fields at household appliance levels can measurably alter human brain wave patterns within minutes of exposure.

Plain English Summary

Summary written for general audiences

Researchers exposed 33 people to extremely low frequency magnetic fields at different frequencies (4-50 Hz) for 2 minutes each and measured their brain waves using EEG. They found that magnetic fields at specific frequencies could synchronize with and alter corresponding brain wave patterns, particularly in the alpha and beta frequency ranges. This suggests that magnetic fields can directly influence brain activity in measurable ways.

Why This Matters

This research provides compelling evidence that even brief exposures to extremely low frequency magnetic fields can measurably alter human brain activity. The study used rigorous double-blind methodology and found that magnetic fields at 0.02 milliTesla - a level you might encounter near household appliances or power lines - can synchronize with natural brain rhythms. What makes this particularly significant is that the effects persisted and even increased during a second exposure session an hour later, suggesting the brain doesn't simply adapt to these fields. While the researchers frame their findings as potentially therapeutic, the reality is that involuntary exposure to ELF fields from our electrical infrastructure and devices may be influencing our brain function in ways we're only beginning to understand. The science demonstrates that our brains are not immune to electromagnetic interference, even at relatively low exposure levels.

Exposure Details

Magnetic Field
0.02 mG
Source/Device
4–50 Hz
Exposure Duration
2 min

Exposure Context

This study used 0.02 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: 0.02 mGExtreme Concern - 5 mGFCC Limit - 2,000 mGEffects observed in the No Concern rangeFCC limit is 100,000x 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 aims at extending our ELF pilot study to investigate whether MF exposures at ELF in series from 50, 16.66, 13, 10, 8.33 to 4 Hz could alter relative power within the corresponding EEG bands.

33 human subjects were tested under a double-blind and counter-balanced conditions. The multiple rep...

The results from this study have shown that narrow alpha1 (7.5–9.5 Hz) and alpha2 (9–11 Hz) bands, a...

This type of EEG synchronisation of driving alpha and beta EEG by alpha and beta sinusoidal MF stimulation, demonstrated in this study, could possibly be applied as therapeutic treatment(s) of particular neurophysiological abnormalities such as sleep and psychiatric disorders.

Cite This Study
Cvetkovic D, Cosic I. (2009). Alterations of human electroencephalographic activity caused by multiple extremely low frequency magnetic field exposures Med Biol Eng Comput. 47(10):1063-1073, 2009.
Show BibTeX
@article{d_2009_alterations_of_human_electroencephalographic_238,
  author = {Cvetkovic D and Cosic I. },
  title = {Alterations of human electroencephalographic activity caused by multiple extremely low frequency magnetic field exposures},
  year = {2009},
  doi = {10.1007/s11517-009-0525-1},
  url = {https://link.springer.com/article/10.1007/s11517-009-0525-1},
}
DOI: 10.1007/s11517-009-0525-1

Cited By (33 papers)

Quick Questions About This Study

Yes, research shows that extremely low frequency magnetic fields (4-50 Hz) can synchronize with and alter corresponding brain wave patterns. A 2009 study found that exposing people to specific frequencies like 8.33 Hz and 10 Hz significantly modified their alpha brain waves in measurable ways.
Research demonstrates that power line frequencies can significantly alter alpha brain wave activity. A study exposing 33 people to 8.33 Hz and 10 Hz magnetic fields found significantly lower alpha1 and alpha2 brain wave activity in temporal and parietal brain regions during the first exposure session.
ELF magnetic field exposure can affect brain waves within 10-16 minutes of initial exposure. Research found that 2-minute exposures to specific frequencies (4-50 Hz) created measurable changes in alpha and beta brain wave patterns that persisted for over an hour after exposure.
Yes, 13 Hz magnetic field exposure can increase beta brain wave activity. Research found that beta1 brain waves (12-14 Hz) showed significant increases in the frontal brain region after exposure to 13 Hz magnetic fields, demonstrating frequency-specific brain wave entrainment effects.
Researchers suggest ELF magnetic field therapy could potentially treat sleep and psychiatric disorders. The ability of specific frequencies (4-50 Hz) to synchronize with and alter corresponding brain wave patterns may offer therapeutic applications for neurophysiological abnormalities, though more research is needed.