Document Detail

Assessing the evolution of the evoked potential average: a new color display method.
MedLine Citation:
PMID:  2924561     Owner:  NLM     Status:  MEDLINE    
A new method to control the averaging process and to check the stability of evoked potential (EP) components is described. The principle of the method is based on the display of the consecutive averages of the EP after each stimulus in a color-coded picture. In this way the evolution of the process is visualised instead of only the last average. The colors are assigned according to the amplitudes. The resulting picture initially consists of erratic colors. However, with increasing numbers of stimuli, tracks of one color soon emerge, indicating stable components. The number of stimuli necessary to generate a stable peak and the duration of stability can easily be quantified. Details with regard to the methods of extraction of essential data and data compression to record the picture are described. The color display method was evaluated with the analysis of 18 somatosensory evoked potentials and 17 visual evoked potentials of controls and 33 EPs of 18 patients. It is shown that this method preserves essential information about the averaging process: the stability of the EP components can be quantified and consequently the optimum number of stimuli to be applied. Furthermore, 14 of the 33 patient recordings showed artifacts, which could be traced with the average-evolution method, but not from the final average alone.
H T Haenen; M J Zwarts; S Boonstra
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Computer methods and programs in biomedicine     Volume:  28     ISSN:  0169-2607     ISO Abbreviation:  Comput Methods Programs Biomed     Publication Date:  1989 Feb 
Date Detail:
Created Date:  1989-04-27     Completed Date:  1989-04-27     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  8506513     Medline TA:  Comput Methods Programs Biomed     Country:  NETHERLANDS    
Other Details:
Languages:  eng     Pagination:  93-100     Citation Subset:  IM    
Department of Clinical Neurophysiology, University Hospital Groningen, The Netherlands.
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MeSH Terms
Computer Graphics*
Evoked Potentials, Somatosensory*
Evoked Potentials, Visual*
Signal Processing, Computer-Assisted

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