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Related Experiment Videos

Consistent magnetic-field induced dynamical changes in rabbit brain activity detected by recurrence quantification

Andrew A Marino1, Erik Nilsen, Clifton Frilot

  • 1Department of Orthopaedic Surgery, Louisiana State University Health Sciences Center, 1501 Kings Highway, P.O. Box 33932, Shreveport, LA 71130-3932, USA. amarino@lsuhsc.edu

Brain Research
|September 25, 2002
PubMed
Summary

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This study reveals that electromagnetic fields (EMFs) alter brain electrical activity in rabbits. A novel nonlinear analysis of the electroencephalogram (EEG) consistently detected these EMF effects, unlike linear methods.

Area of Science:

  • Neuroscience
  • Biophysics
  • Electromagnetism

Background:

  • Inconsistent findings exist regarding electromagnetic field (EMF) effects on brain electrical activity.
  • Linear analysis methods may contribute to variability in previous research.

Purpose of the Study:

  • To investigate the effects of EMFs on rabbit electroencephalogram (EEG) using a novel nonlinear approach.
  • To determine if nonlinear methods can provide consistent results for EMF exposure effects on brain activity.

Main Methods:

  • EEG data from rabbits exposed to 60 Hz, 2.5 G EMFs were analyzed.
  • Phase space embedding and local recurrence plots were used for nonlinear analysis.
  • Recurrence plot quantifiers assessed brain activity changes between exposed and control epochs.

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Main Results:

  • Statistically significant alterations in EEG were observed in all exposed rabbits (n=10).
  • Results were replicated, and a positive control confirmed the EMF effect, not the analysis method.
  • Anesthesia experiments suggested N-methyl-D-aspartate and/or alpha(2)-adrenoceptor mediation.

Conclusions:

  • Nonlinear analysis consistently demonstrates EMF transduction leading to changes in brain electrical activity.
  • The observed effects are biological, not artifacts of electrode interaction, as shown by post-mortem experiments.