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  Patterns that impair discrimination of line orientation in human vision

Wehrhahn, C., Li, W., & Westheimer, G. (1996). Patterns that impair discrimination of line orientation in human vision. Perception, 25(9), 1053-1064. doi:10.1068/p251053.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-EB18-A Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-EB19-8
Genre: Journal Article

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Wehrhahn, C1, Author              
Li, W, Author
Westheimer, G, 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: The threshold for detecting a change in orientation away from the vertical of a briefly presented foveal line target is raised when there are immediately following visual presentations. This masking effect was examined by measuring the capacity of a variety of patterns to act as masks. When patterns were made of exactly the same number of light pixels, masking was least when they formed random dots and progressively became stronger as they formed lines of decreasing curvature from full circles to straight lines. The longer the lines, the stronger the masking. Threshold elevation was highest when the masking pattern was spatially superimposed on the line and was lessened when a large surround area was included, but there was still considerable masking when the interfering patterns were confined to the surround. By placing masks and test lines in different eyes, or by giving them opposite contrast polarity, almost complete interocular and interpolarity transfer was demonstrated. Relating these results to anatomical and electrophysiological findings about neurons in the primary visual cortex leads to the conclusion that the masking effects could have their substrates in interaction between cells in V1.

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 Dates: 1996-09
 Publication Status: Published in print
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 Identifiers: URI: http://www.perceptionweb.com/abstract.cgi?id=p251053
DOI: 10.1068/p251053
BibTex Citekey: 547
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Title: Perception
Source Genre: Journal
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Pages: - Volume / Issue: 25 (9) Sequence Number: - Start / End Page: 1053 - 1064 Identifier: -