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Brain & Nervous System

Modeling of EEG electrode artifacts and thermal ripples in human radiofrequency exposure studies.

No Effects Found

Murbach, M., Neufeld, E., Christopoulou, M., Achermann, P. and Kuster, N. · 2014

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This study confirms RF exposure changes brain activity but scientists still don't understand the biological mechanism behind these effects.

Plain English Summary

Summary written for general audiences

Researchers investigated why radiofrequency radiation from cell phones appears to affect brain activity patterns (EEG) during sleep studies. They tested three possible explanations using computer models and found that RF exposure doesn't significantly heat the brain or interfere with electrode measurements. While the study ruled out these technical artifacts, the actual mechanism behind RF's effects on brain activity remains unexplained.

Exposure Information

A logarithmic frequency spectrum from 10 Hz to 100 GHz showing where this study's 2.14 GHz exposure sits relative to common EMF sources.Where This Frequency Sits on the EMF SpectrumELFVLFLF / MFHF / VHFUHFSHFmm10 Hz100 GHzThis study: 2.14 GHzPower lines50/60 Hz5G mm28 GHzLogarithmic scale

The study examined exposure from: 900 and 2140 MHz

Study Details

The effects of radiofrequency (RF) exposure on wake and sleep electroencephalogram (EEG) have been in focus since mobile phone usage became pervasive. It has been hypothesized that effects may be explained by (1) enhanced induced fields due to RF coupling with the electrode assembly, (2) the subsequent temperature increase around the electrodes, or (3) RF induced thermal pulsing caused by localized exposure in the head.

We evaluated these three hypotheses by means of both numerical and experimental assessments made wit...

Our results indicate that hypothesis 1 can be rejected, as the induced fields cause <20% increase in...

Cite This Study
Murbach, M., Neufeld, E., Christopoulou, M., Achermann, P. and Kuster, N. (2014). Modeling of EEG electrode artifacts and thermal ripples in human radiofrequency exposure studies. Bioelectromagnetics. 2014 . doi: 10.1002/bem.21837.
Show BibTeX
@article{murbach_2014_modeling_of_eeg_electrode_3260,
  author = {Murbach and M. and Neufeld and E. and Christopoulou and M. and Achermann and P. and Kuster and N. },
  title = {Modeling of EEG electrode artifacts and thermal ripples in human radiofrequency exposure studies.},
  year = {2014},
  
  url = {https://pubmed.ncbi.nlm.nih.gov/24523224/},
}
PubMed: 24523224

Cited By (16 papers)

View all 16 citing papers on Semantic Scholar

Quick Questions About This Study

A 2014 study found that EEG electrode artifacts don't explain brain activity changes during RF exposure. Researchers tested whether 900 MHz and 2140 MHz signals interfere with electrodes or heat the brain, but ruled out both explanations. The actual mechanism remains unknown.
No, computer modeling showed 900 MHz radiation causes maximum brain temperature increases below 0.1°C and skin heating of only 0.31°C. These minimal temperature changes are unlikely to alter brain physiology or explain EEG changes during RF exposure studies.
Research found RF pulses create negligible thermal ripples in brain tissue - less than 0.001°C for GSM-like signals and under 0.004°C even at 20-fold higher pulse energy. These tiny temperature fluctuations cannot explain observed EEG changes.
Studies show RF fields cause less than 20% increase in specific absorption rate around EEG electrodes. This minimal interference cannot account for the brain activity changes observed in radiofrequency exposure studies, ruling out direct electrode interference.
The mechanism behind brain wave changes during 2140 MHz exposure remains unexplained. A 2014 study eliminated heating effects, electrode interference, and thermal ripples as possible causes, leaving the actual interaction between RF and brain activity unknown.