Document Detail


The reproducibility of binocular pattern reversal visual evoked potentials: a single subject design.
MedLine Citation:
PMID:  21437618     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
This study aimed to investigate the within-participant variability over time of both amplitude and peak latency measures of pattern reversal visual evoked potentials (pVEPs). As a large number of factors are known to contribute to the variability of the pVEPs (such as fixation instability and drowsiness), testing was conducted in controlled conditions with two co-operative participants. PVEPs were recorded during 24 sessions, over an eight-week period using the same equipment and recording settings. The participants viewed a plasma monitor binocularly from a distance of 1 meter. High contrast (97%), black and white checks of side subtense 50', 25', and 12.5' pattern reversed 3/s in a 28 degree test field. The different sized checks were presented in a pseudo-random order. Three runs, each of 100 trials, were acquired to each stimulus from an active electrode placed at Oz referred to aFz. The amplitude of N80-P100 and the latency of P100 were measured. P100 amplitude and latency were stable across sessions and did not depend upon the order of check size presentation. As expected, variation in amplitude was greater than peak latency. The coefficients of variation for different check sizes and participants were 9-14% for pVEP amplitude, but only 1-2% for P100 latency.
Authors:
Tessa B Mellow; Alki Liasis; Ruth Lyons; Dorothy A Thompson
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-3-25
Journal Detail:
Title:  Documenta ophthalmologica. Advances in ophthalmology     Volume:  -     ISSN:  1573-2622     ISO Abbreviation:  -     Publication Date:  2011 Mar 
Date Detail:
Created Date:  2011-3-25     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0370667     Medline TA:  Doc Ophthalmol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Clinical and Academic Department of Ophthalmology, Great Ormond Street Hospital For Children, London, UK.
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