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Sharpness overconstancy: the roles of visibility and current context

By Susan J Galvin, Robert P O\u27Shea, Abigail M Squire and Diane S Hailstone

Abstract

In a previous study we found that blurred edges presented in peripheral vision look sharper than when they are looked at directly, a phenomenon we have called peripheral sharpness overconstancy (Galvin et al. (1997). Vision Research, 37, 2035-2039). In the current study we show that when visibility of the stimulus edges is compromised by very brief presentations, we can demonstrate sharpness overconstancy for static, foveal viewing. We also test whether the degree of sharpening is a function of the current visual context, but find no difference between the peripheral sharpness overconstancy (at 24 degrees eccentricity) of edges measured in a blurred context and that measured in a sharp context. We conclude that if the visual system does carry a template for sharp edges which contributes to edge appearance when visibility is poor, then that template is resistant to changes in context

Topics: Sharpness overconstancy, Edge blur, Visibility, Context, Appearance, Medicine and Health Sciences
Publisher: ePublications@SCU
Year: 1999
DOI identifier: 10.1016/s0042-6989(98)00306-x
OAI identifier: oai:epubs.scu.edu.au:hahs_pubs-2357
Provided by: ePublications@SCU
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