Document Detail

An oblique effect of chromatic gratings measured by color-mixture thresholds.
MedLine Citation:
PMID:  11145084     Owner:  NLM     Status:  MEDLINE    
Contrast sensitivity is lower for obliquely oriented achromatic gratings than for vertical or horizontal gratings at high spatial and low temporal frequencies. Although this response is suggestive of mediation by P-pathway cortical correlates, no clear sensory (i.e. class 1) oblique effect has been demonstrated with isoluminant chromatic stimuli. In the present experiment, a two-alternative forced-choice detection task was used to measure observers' sensitivity to spatiotemporal sinusoids varying in orientation and color contrast. A maximum-likelihood method fit ellipses to the thresholds, with the length of each ellipse taken as a measure of chromatic contrast sensitivity at isoluminance, and the width as luminance contrast threshold. A chromatic oblique effect was observed at about 3 cycles deg-1 suggesting an orientation bias within the cortical stream conveying P-cell activity.
W K Krebs; E A Essock; S E Buttrey; M J Sinai; J S McCarley
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Perception     Volume:  29     ISSN:  0301-0066     ISO Abbreviation:  Perception     Publication Date:  2000  
Date Detail:
Created Date:  2000-12-28     Completed Date:  2001-02-08     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0372307     Medline TA:  Perception     Country:  England    
Other Details:
Languages:  eng     Pagination:  927-35     Citation Subset:  IM    
Naval Postgraduate School, Department of Operations Research, Monterey, CA 93943, USA.
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MeSH Terms
Color Perception*
Contrast Sensitivity*
Photic Stimulation / methods
Psychometrics / methods
Sensory Thresholds

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

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