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  Contrast dependency of foveal spatial functions: orientation, vernier, separation, blur and displacement discrimination and the tilt and Poggendorff illusions.

Westheimer, G., Brincat, S., & Wehrhahn, C. (1999). Contrast dependency of foveal spatial functions: orientation, vernier, separation, blur and displacement discrimination and the tilt and Poggendorff illusions. Vision Research, 39, 1631-1639.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-E721-1 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-E722-0
Genre: Journal Article

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Westheimer, G, Author
Brincat, S, Author
Wehrhahn, C1, Author              
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1Department Physiology of Cognitive Processes, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497798              

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 Abstract: To examine the effect of reducing luminance contrast in human foveal vision, discrimination thresholds were measured in four tasks and also a numerical measure of two visual illusions were obtained by a nulling technique. The patterns used for all tasks were made very similar to facilitate comparison between them-all featured luminance step edges whose contrast could be varied from near unity down to the detection threshold. Orientation, vernier and blur discrimination thresholds rise on average 5-6-fold when the contrast is reduced from near unity to a Michelson value of 0.03. Jump displacement thresholds are somewhat more robust to contrast reduction, and the curve of separation discrimination versus contrast is much shallower, rising by a factor of about 2. The magnitude of the Poggendorff and tilt illusions changes very little until the inducing contours are barely detectable. (C) 1999 Elsevier Science Ltd. All rights reserved.

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 Dates: 1999
 Publication Status: Published in print
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 Identifiers: BibTex Citekey: 224
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Title: Vision Research
Source Genre: Journal
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Pages: - Volume / Issue: 39 Sequence Number: - Start / End Page: 1631 - 1639 Identifier: -