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| Research article summary (published 30 Aug 2002): |
The importance of spatial scale in determining illusions of orientation.
Full Abstract
The twisted-cord illusion is a powerful demonstration of interaction between 1st-order (luminance-defined) and 2nd-order (contrast-defined) orientation processing. The perceived orientation of contrast-defined objects is pulled towards their 1st-order orientation content when the difference in orientation is small (Fraser effect), yet is pushed away from the 1st-order content at large orientation differences (Zöllner effect). Here we show that the relative spatial scale of carrier and envelope represents a decisive factor in determining the magnitude and direction of such interactions. We conclude that the perceived 2nd-order structure of a stimulus is biased by the properties of the 1st-order structure in a manner that depends on relative, rather than absolute spatial scale.
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Author information
Author/s: Skillen, Jennifer (J); Whitaker, David (D); Popple, Ariella V (AV); McGraw, Paul V (PV);
Affiliation: Department of Optometry, University of Bradford, Richmond Road, Bradford, BD7 1DP, UK. j.skillen(-atsign-)bradford.ac.uk
Journal and publication information
Publication Type: Journal Article; Research Support, Non-U.S. Gov't
Journal: Vision research (Vision Res), published in England. (Language: eng)
Reference: 2002-Sep; vol 42 (issue 21) : pp 2447-55
Dates: Created 2002/10/07; Completed 2002/12/16; Revised 2006/11/15;
PMID: 12367743, status: MEDLINE (last retrieval date: 11/6/2008)
Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.
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