| Foveal spatial summation in human cone mechanism. | |
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MedLine Citation:
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PMID: 21513184 Owner: NLM Status: In-Process |
Abstract/OtherAbstract:
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We measured at the fovea the chromatic contrast threshold for stimuli modulated along different chromatic directions in the isoluminant plane of MBDKL colour space, considering the two cardinal axes (L/M) and S/(L + M) and other intermediate non-cardinal directions. This psychophysical determination was conducted as a function of stimulus size. The test stimulus was a foveal isoluminant Gaussian patch with a raised cosinusoidal temporal profile superimposed on a neutral background. The task was performed binocularly. The increment threshold was measured for three observers by a Bayesian adaptive psychometric method (QUEST). The Ricco area of complete spatial summation was estimated from the threshold-versus-area curves. The perceptive fields are smaller for the L/M-cone opponent direction than the S/(L + M)-cone opponent. The perceptive field sizes for the stimuli in non-cardinal chromatic directions and stimuli modulated at the (L/M)-cone opponent direction present similar values. Measurements were made at two luminance levels, 5 and 40 cd m(-2), but the differences found were small. The perceptive field sizes found could be associated with LGN area. |
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Authors:
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Beatriz M O'Donell; Elisa M Colombo |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Perception Volume: 40 ISSN: 0301-0066 ISO Abbreviation: Perception Publication Date: 2011 |
Date Detail:
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Created Date: 2011-04-25 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0372307 Medline TA: Perception Country: England |
Other Details:
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Languages: eng Pagination: 50-62 Citation Subset: IM |
Affiliation:
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Departamento de Luminotecnia Luz y Visión "Ing. Herberto C. Bühler", Facultad de Ciencias Exactas y Tecnologia, Universidad Nacional de Tucumán, Av. Independencia 1800, San Miguel de Tucumán, Argentina. bodonell@herrera.unt.edu.ar |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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