Document Detail

Variability of the steady-state visually evoked potential: interindividual variance and intraindividual reproducibility of spatial frequency tuning.
MedLine Citation:
PMID:  2265577     Owner:  NLM     Status:  MEDLINE    
At low contrast levels there is good agreement between the psychophysical contrast sensitivity function and the tuning curve of the visually evoked potential (i.e., VEP amplitude vs spatial frequency). At high contrast, however, some researchers have found bimodal VEP tuning curves whereas others have not. We studied the VEP in 22 subjects in a short-term cross-sectional study and in 13 subjects in a longitudinal study over 8 sessions covering 28 days. Grating stimuli with 60% contrast were square-wave modulated in time (7.8 reversals/s) and space (0.06-16 cycles/degree). We found large interindividual variance in the shape of the tuning curves; about half of the subjects showed a unimodal shape, while the other half showed a bimodal one (with a 'notch' between 1 and 2 cycles/degree). These features turned out to be stable in the longitudinal study, where variability could mainly be ascribed to a multiplicative influence common to all spatial frequencies. The marked interindividual differences in the shape of the tuning curve, which seem to be intraindividually stable, may explain previous discrepancies. It is not yet clear why the notch exists in about half of our subjects.
W Joost; M Bach
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Documenta ophthalmologica. Advances in ophthalmology     Volume:  75     ISSN:  0012-4486     ISO Abbreviation:  Doc Ophthalmol     Publication Date:  1990 Aug 
Date Detail:
Created Date:  1991-02-08     Completed Date:  1991-02-08     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0370667     Medline TA:  Doc Ophthalmol     Country:  NETHERLANDS    
Other Details:
Languages:  eng     Pagination:  59-66     Citation Subset:  IM    
Universitäts-Augenklinik, Freiburg, Germany.
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MeSH Terms
Contrast Sensitivity / physiology
Cross-Sectional Studies
Evoked Potentials, Visual / physiology*
Longitudinal Studies
Middle Aged
Reproducibility of Results
Visual Acuity

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

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