Document Detail

Far-field potentials recorded from action potentials and from a tripole in a hemicylindrical volume.
MedLine Citation:
PMID:  2469568     Owner:  NLM     Status:  MEDLINE    
There is growing evidence in support of the hypothesis that far-field potentials are recorded when action potentials encounter discontinuities in the surrounding volume. The present study found further support for this hypothesis using two methods of experimentation. The first method recorded potentials when the action potential from an isolated bullfrog sciatic nerve in a hemicylindrical volume (i) encountered a change in the shape of the surrounding volume, (ii) crossed a boundary between 2 volumes of differing resistivities, (iii) reached a bend in the nerve, or (iv) reached the functional end of the nerve. In the second method, potentials were recorded when an electrical tripole, constructed in a way to produce the electrical equivalent of an action potential, encountered the same discontinuities as well as when it was configured to simulate a curved nerve. These results are consistent with the hypothesis that dipole components of an action potential predominant in far-field recordings.
D L Jewett; D L Deupree
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Publication Detail:
Type:  In Vitro; Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Electroencephalography and clinical neurophysiology     Volume:  72     ISSN:  0013-4694     ISO Abbreviation:  Electroencephalogr Clin Neurophysiol     Publication Date:  1989 May 
Date Detail:
Created Date:  1989-06-16     Completed Date:  1989-06-16     Revised Date:  2008-09-09    
Medline Journal Info:
Nlm Unique ID:  0375035     Medline TA:  Electroencephalogr Clin Neurophysiol     Country:  IRELAND    
Other Details:
Languages:  eng     Pagination:  439-49     Citation Subset:  IM    
Department of Orthopaedic Surgery, University of California, San Francisco 94143-0728.
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MeSH Terms
Action Potentials*
Rana catesbeiana
Sciatic Nerve / physiology*
Grant Support

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