| The gap effect is exaggerated in parafovea. | |
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MedLine Citation:
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PMID: 16961988 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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In central vision, the discrimination of colors lying on a tritan line is improved if a small gap is introduced between the two stimulus fields. Boynton et al. (1977) called this a "positive gap effect." They found that the effect was weak or absent for discriminations based on the ratio of the signals of long-wave and middle-wave cones; and even for tritan stimuli, the gap effect was weakened when forced choice or brief durations were used. We here describe measurements of the gap effect in the parafovea. The stimuli were 1 deg of visual angle in width and were centered on an imaginary circle of radius 5 deg. They were brief (100 ms), and thresholds were measured with a spatial two-alternative forced choice. Under these conditions we find a clear gap effect, which is of similar magnitude for both the cardinal chromatic axes. It may be a chromatic analog of the crowding effect observed for parafoveal perception of form. |
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Authors:
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Marina Danilova; John Mollon |
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Publication Detail:
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Type: Comparative Study; Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Visual neuroscience Volume: 23 ISSN: 0952-5238 ISO Abbreviation: Vis. Neurosci. Publication Date: 2006 May-Aug |
Date Detail:
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Created Date: 2006-09-11 Completed Date: 2006-10-18 Revised Date: 2009-11-18 |
Medline Journal Info:
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Nlm Unique ID: 8809466 Medline TA: Vis Neurosci Country: England |
Other Details:
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Languages: eng Pagination: 509-17 Citation Subset: IM |
Affiliation:
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I P Pavlov Institute of Physiology, Laboratory of Visual Physiology, St. Petersburg, Russia. dan@pavlov.infran.ru |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Analysis of Variance Color Perception / physiology* Discrimination (Psychology) / physiology Fovea Centralis / physiology* Humans Photic Stimulation / methods Reaction Time / physiology* Sensory Thresholds / physiology Space Perception / physiology Visual Fields / physiology* |
| Grant Support | |
ID/Acronym/Agency:
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072684//Wellcome Trust; 072684/Z/03/Z//Wellcome Trust |
| Comments/Corrections | |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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