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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(9), 1631-1639. doi:10.1016/S0042-6989(98)00200-4.

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Westheimer, G, Author
Brincat, S, Author
Wehrhahn, C1, 2, Author           
Affiliations:
1Department Physiology of Cognitive Processes, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497798              
2Max Planck Institute for Biological Cybernetics, Max Planck Society, Spemannstrasse 38, 72076 Tübingen, DE, ou_1497794              

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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: 1999-05
 Publication Status: Issued
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 Identifiers: BibTex Citekey: 224
DOI: 10.1016/S0042-6989(98)00200-4
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Title: Vision Research
  Other : Vision Res.
Source Genre: Journal
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Publ. Info: Amsterdam : Pergamon
Pages: - Volume / Issue: 39 (9) Sequence Number: - Start / End Page: 1631 - 1639 Identifier: ISSN: 0042-6989
CoNE: https://pure.mpg.de/cone/journals/resource/954925451842