Document Detail

Nonlinear EEG activation evoked by low-strength low-frequency magnetic fields.
MedLine Citation:
PMID:  17350168     Owner:  NLM     Status:  MEDLINE    
Recent electrophysiological evidence suggested the existence of a human magnetic sense, but the kind of dynamical law that governed the stimulus-response relationship was not established. We tested the hypothesis that brain potentials evoked by the onset of a weak, low-frequency magnetic field were nonlinearly related to the stimulus. A field of 1G, 60 Hz was applied for 2s, with a 5s inter-stimulus period, and brain potentials were recorded from occipital electrodes in eight subjects, each of whom were measured twice, with at least 1 week between measurements. The recorded signals were subjected to nonlinear (recurrence analysis) and linear (time averaging) analyses. Using recurrence analysis, magnetosensory evoked potentials (MEPs) were detected in each subject in both the initial and replicate studies, with one exception. All MEPs exhibited the expected latency but differed in dynamical characteristics, indicating that they were nonlinearly related to the stimulus. MEPs were not detected using time averaging, thereby further confirming their nonlinearity. Evolutionarily conditioned structures that help mediate linear field-transduction in lower life forms may be expressed and functionally utilized in humans, but in a role where they facilitate vulnerability to man-made environmental fields.
Simona Carrubba; Clifton Frilot; Andrew L Chesson; Andrew A Marino
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Publication Detail:
Type:  Journal Article     Date:  2007-02-22
Journal Detail:
Title:  Neuroscience letters     Volume:  417     ISSN:  0304-3940     ISO Abbreviation:  Neurosci. Lett.     Publication Date:  2007 May 
Date Detail:
Created Date:  2007-04-16     Completed Date:  2007-07-25     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7600130     Medline TA:  Neurosci Lett     Country:  Ireland    
Other Details:
Languages:  eng     Pagination:  212-6     Citation Subset:  IM    
Department of Orthopaedic Surgery, LSU Health Sciences Center, Shreveport, LA 71130-3932, USA.
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MeSH Terms
Behavior, Animal / physiology
Brain / physiology,  radiation effects*
Electroencephalography / radiation effects*
Electromagnetic Fields*
Evoked Potentials / physiology,  radiation effects*
Middle Aged
Orientation / physiology
Sensation / physiology
Signal Processing, Computer-Assisted
Transcranial Magnetic Stimulation / methods*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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