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Related Experiment Videos

Alterations in brain electrical activity caused by magnetic fields: detecting the detection process.

G B Bell1, A A Marino, A L Chesson

  • 1Department of Orthopaedic Surgery, Louisiana State University Medical Center, Shreveport 71130-3932.

Electroencephalography and Clinical Neurophysiology
|December 1, 1992
PubMed
Summary

Human subjects exposed to static and 60 Hz magnetic fields showed altered electroencephalogram (EEG) activity, indicating the nervous system can detect magnetic fields. Most subjects displayed increased EEG power across various frequencies.

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Area of Science:

  • Neuroscience
  • Biophysics
  • Electrophysiology

Background:

  • The nervous system's interaction with external magnetic fields is not fully understood.
  • Previous research suggests potential biological effects of electromagnetic fields.

Purpose of the Study:

  • To investigate the effects of static and 60 Hz magnetic fields on human electroencephalogram (EEG) activity.
  • To explore the potential for magnetic field detection within the nervous system.

Main Methods:

  • Twenty human subjects were exposed to static and 60 Hz magnetic fields (0.78 gauss) individually and combined.
  • EEG power spectrum analysis was performed during field exposure and compared to control epochs.
  • Data were analyzed for changes in EEG activity at specific frequencies and electrode locations.

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Main Results:

  • All but one subject showed magnetic field-induced alterations in their EEG.
  • Increased EEG activity at 1-18.5 Hz was observed in most subjects.
  • Changes were more frequent at central and parietal electrodes compared to occipital electrodes.

Conclusions:

  • The human nervous system possesses detection loci for magnetic fields.
  • The observed EEG alterations suggest a direct biological response to magnetic field exposure.
  • The findings do not support the ion-resonance mechanism involving Ca2+ as the sole explanation.