| Defining the limits of flicker defined form: effect of stimulus size, eccentricity and number of random dots. | |
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MedLine Citation:
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PMID: 15695191 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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We investigated the spatio-temporal limits of flicker defined form (FDF) phase contrast thresholds generated from the phantom contour illusion. Random dots (diameter 0.25 degrees, tapered edge) were used throughout the test field. FDF was generated using circular stimuli (temporal frequency 30 Hz, mean background luminance 50 cdm(-2)), the edges being defined by illusory borders generated from the out-of-phase dots within the display. Thresholds improved with increasing stimulus size and number of random dots at all eccentricities. For a constant threshold, fewer random dots were required with increasing eccentricity. Predictive mathematical relationships between contrast threshold, stimulus size and random dot number are discussed. |
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Authors:
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P T Quaid; J G Flanagan |
Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2004-11-30 |
Journal Detail:
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Title: Vision research Volume: 45 ISSN: 0042-6989 ISO Abbreviation: Vision Res. Publication Date: 2005 Apr |
Date Detail:
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Created Date: 2005-02-07 Completed Date: 2005-05-03 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 0417402 Medline TA: Vision Res Country: England |
Other Details:
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Languages: eng Pagination: 1075-84 Citation Subset: IM |
Affiliation:
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School of Optometry, University of Waterloo, Ont., Canada N2L 3G1. ptquaid@sciborg.uwaterloo.ca |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Contrast Sensitivity / physiology Flicker Fusion / physiology* Form Perception / physiology* Humans Optical Illusions / physiology* Pattern Recognition, Visual / physiology Photic Stimulation / methods Psychophysics Sensory Thresholds Visual Pathways / physiology |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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