Document Detail

The dimensionality of the human visual evoked scalp potential.
MedLine Citation:
PMID:  57049     Owner:  NLM     Status:  MEDLINE    
A small number of processes can account for most of the evoked potentials activity in the two subjects studied. Principal components analysis indicates that six independent processes can account for approximately 97% of the variability in the data. Moreover, the factor analysis and plots of the factor coefficients yield indications that the times during which these principal factors are active agree quite well with the times at which the equipotential maps show some organized activity. The question of dipoles being the underlying cause of the observed activity is not answered by the factor analysis. The principal factors are not unique, but models which have a small number of parameters are more justifiable in light of the results of this study.
R N Kavanagh; T M Darcey; D H Fender
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Electroencephalography and clinical neurophysiology     Volume:  40     ISSN:  0013-4694     ISO Abbreviation:  Electroencephalogr Clin Neurophysiol     Publication Date:  1976 Jun 
Date Detail:
Created Date:  1976-07-06     Completed Date:  1976-07-06     Revised Date:  2008-09-09    
Medline Journal Info:
Nlm Unique ID:  0375035     Medline TA:  Electroencephalogr Clin Neurophysiol     Country:  NETHERLANDS    
Other Details:
Languages:  eng     Pagination:  633-44     Citation Subset:  IM; S    
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MeSH Terms
Brain / physiology
Electroencephalography / methods*
Electronics, Medical
Evoked Potentials*
Factor Analysis, Statistical
Models, Neurological
Time Factors
Visual Perception / physiology*

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

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