Document Detail

Temporal properties of the visual responses to luminance and contrast modulated noise.
MedLine Citation:
PMID:  12826109     Owner:  NLM     Status:  MEDLINE    
Vision is sensitive to first-order luminance modulations and second-order modulations of carrier contrast. Our knowledge of the temporal properties of second-order vision is insufficient and contradictory. Using temporal summation and reaction time paradigms, we found that the type of visual noise (static or dynamic) determines the temporal properties of the responses to luminance and contrast modulations. In the presence of static noise, the temporal responses to both types of modulation of low and higher spatial frequencies were transient. When dynamic noise was used, the temporal responses to luminance and contrast modulations of higher spatial frequencies were sustained. At low spatial frequency, however, luminance modulations elicited transient responses, while contrast modulated dynamic noise produced sustained responses. The reaction times to near-threshold contrast modulations of low spatial frequency were slower than those to first-order patterns and they did not significantly differ at modulations of higher spatial frequency. The results suggest that the temporal characteristics of first-stage linear filters which feed the second-order pathway may determine the temporal responses to contrast modulated noise.
Velitchko Manahilov; Julie Calvert; William A Simpson
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Vision research     Volume:  43     ISSN:  0042-6989     ISO Abbreviation:  Vision Res.     Publication Date:  2003 Aug 
Date Detail:
Created Date:  2003-06-26     Completed Date:  2003-08-12     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0417402     Medline TA:  Vision Res     Country:  England    
Other Details:
Languages:  eng     Pagination:  1855-67     Citation Subset:  IM    
Department of Vision Sciences, Glasgow Caledonian University, City Campus, Cowcaddens Road, Glasgow, Scotland G4 0BA, UK.
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MeSH Terms
Contrast Sensitivity / physiology*
Fourier Analysis
Motion Perception / physiology*
Photic Stimulation
Reaction Time
Visual Perception / physiology

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

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