Document Detail


An oblique effect of chromatic gratings measured by color-mixture thresholds.
MedLine Citation:
PMID:  11145084     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
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.
Authors:
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    
Affiliation:
Naval Postgraduate School, Department of Operations Research, Monterey, CA 93943, USA. william.krebs@faa.gov
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MeSH Terms
Descriptor/Qualifier:
Adult
Color Perception*
Contrast Sensitivity*
Humans
Male
Photic Stimulation / methods
Psychometrics / methods
Sensory Thresholds

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


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