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| Research article summary (published 29 Apr 2003): |
When does the visual system use viewpoint-invariant representations during recognition?
Full Abstract
One popular model of object recognition claims that the visual system typically describes objects using view-specific representations, but that viewpoint-invariant representations are used when objects can be specified uniquely by the arrangement of parts along a single dimension. In a series of three naming experiments using novel, two-dimensional line drawings, we test this hypothesis against alternative accounts of when viewpoint-invariant representations are used during the recognition of upright and viewplane-rotated objects. Experiments 1 and 2 demonstrate that the number of dimensions along which featural information must be represented is the only stimulus feature that influences the type of representation used, consistent with the Tarr and Pinker model. Experiment 3, however, reveals that the use of viewpoint-invariant representations during recognition is not driven purely by stimulus features, and is at least partly under voluntary control. These data suggest that viewpoint-invariant representations are not automatically invoked by the visual system when the requisite stimulus features are present. Rather, our results suggest that top-down control processes, as well as bottom-up stimulus features, jointly determine the conditions under which the visual system uses viewpoint-invariant representations during visual recognition.
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Author information
Author/s: Wilson, Kevin D (KD); Farah, Martha J (MJ);
Affiliation: Department of Psychology, University of Pennsylvania, 3815 Walnut Street, Pennsylvania, PA 19104, USA. kwilson@duke.edu
Grants: R01-AG14082 (Agency:United States NIA)
Journal and publication information
Publication Type: Clinical Trial; Journal Article; Research Support, U.S. Gov't, P.H.S.
Journal: Brain research. Cognitive brain research (Brain Res Cogn Brain Res), published in Netherlands. (Language: eng)
Reference: 2003-May; vol 16 (issue 3) : pp 399-415
Dates: Created 2003/04/22; Completed 2003/06/30; Revised 2007/11/14;
PMID: 12706220, 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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