| Global shape processing: which parts form the whole? | |
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MedLine Citation:
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PMID: 20884565 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Research suggests that detection of low-frequency radial frequency (RF) patterns involves global shape processing and that points of maximum curvature (corners) contribute more than points of minimum curvature (sides). However, this has only been tested with stimuli presented at the threshold of discriminability from a circle. We used RF pattern adaptation to (a) examine whether a supra-threshold RF pattern is processed as a global shape and (b) determine what the critical features are for representing its shape. We measured the perceived amplitude shift of an RF test pattern after prolonged exposure either to a higher amplitude pattern or to various combinations of its parts (concave maxima, convex maxima, inflections). We found greater shifts in perceived amplitude after adaptation to a "whole" pattern than after adaptation to its component parts, which alternated to produce equal net contrast. Furthermore, when adapting to specific parts of the shape in isolation, we found that each part generated a similar magnitude aftereffect. Although the whole is clearly greater than the sum of the parts, we find that concave maxima, convex maxima, and inflections contribute equally to global shape processing, a fact that is only apparent when using a supra-threshold appearance-based task. |
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Authors:
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Jason Bell; Sarah Hancock; Frederick A A Kingdom; Jonathan W Peirce |
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Publication Detail:
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Type: Comparative Study; Journal Article; Research Support, Non-U.S. Gov't Date: 2010-06-01 |
Journal Detail:
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Title: Journal of vision Volume: 10 ISSN: 1534-7362 ISO Abbreviation: J Vis Publication Date: 2010 |
Date Detail:
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Created Date: 2010-10-04 Completed Date: 2011-03-17 Revised Date: 2012-01-04 |
Medline Journal Info:
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Nlm Unique ID: 101147197 Medline TA: J Vis Country: United States |
Other Details:
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Languages: eng Pagination: 16 Citation Subset: IM |
Affiliation:
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McGill Vision Research, Department of Ophthalmology, McGill University, Montreal, Quebec, Canada. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adaptation, Physiological
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physiology* Figural Aftereffect / physiology* Form Perception / physiology* Humans Pattern Recognition, Visual / physiology* Photic Stimulation Sensory Thresholds Visual Pathways / physiology |
| Grant Support | |
ID/Acronym/Agency:
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085444//Wellcome Trust; 085444/Z/08/Z//Wellcome Trust |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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