Document Detail

Spatial-frequency specific contrast gain and flicker masking of human transient VEP.
MedLine Citation:
PMID:  8160399     Owner:  NLM     Status:  MEDLINE    
We studied the effects of grating contrast and luminance-flicker masking on the early waves of human visually evoked potentials (VEPs) recorded at the onset-offset of sinusoidal gratings of varying spatial frequencies (SFs). At high SFs, the response waveform was simple and VEP was dominated by a negative wave (N110). At low SFs, several positive-negative deflections were recorded, the earliest dominating wave being positive (P90). The amplitude of P90 was saturated at a contrast of about 0.1 and it was attenuated by flicker masking. Masking involved to a lesser extent the waves following P90. It was weaker at the flicker frequency of 5 Hz than at 10 and 20 Hz. No flicker masking was found at SFs higher than 2-4 c/deg. At medium and high SFs, VEPs were obtained at higher contrast levels. No saturation (max contrast tested 0.5) and no flicker masking of N110 were observed. These results suggest that the early VEP components recorded at low and high SFs are related to different types of neuronal activity. Correlation between VEP properties and properties of magnocellular and parvocellular pathways is considered with an emphasis on recent morphological data about the human retina.
A Vassilev; V Stomonyakov; V Manahilov
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Vision research     Volume:  34     ISSN:  0042-6989     ISO Abbreviation:  Vision Res.     Publication Date:  1994 Apr 
Date Detail:
Created Date:  1994-05-18     Completed Date:  1994-05-18     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0417402     Medline TA:  Vision Res     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  863-72     Citation Subset:  IM    
Institute of Physiology, Bulgarian Academy of Sciences, Sofia.
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MeSH Terms
Contrast Sensitivity / physiology*
Evoked Potentials, Visual / physiology*
Flicker Fusion / physiology
Pattern Recognition, Visual / physiology*
Perceptual Masking / physiology
Time Factors

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