Differential effects of delay upon visually and haptically guided grasping and perceptual judgments
Identifieur interne : 004915 ( Main/Exploration ); précédent : 004914; suivant : 004916Differential effects of delay upon visually and haptically guided grasping and perceptual judgments
Auteurs : Charles E. Pettypiece [Canada] ; Jody C. Culham [Canada] ; Melvyn A. Goodale [Canada]Source :
- Experimental brain research [ 0014-4819 ] ; 2009.
Descripteurs français
- Pascal (Inist)
English descriptors
- KwdEn :
Abstract
Experiments with visual illusions have revealed a dissociation between the systems that mediate object perception and those responsible for object-directed action. More recently, an experiment on a haptic version of the visual size-contrast illusion has provided evidence for the notion that the haptic modality shows a similar dissociation when grasping and estimating the size of objects in real-time. Here we present evidence suggesting that the similarities between the two modalities begin to break down once a delay is introduced between when people feel the target object and when they perform the grasp or estimation. In particular, when grasping after a delay in a haptic paradigm, people scale their grasps differently when the target is presented with a flanking object of a different size (although the difference does not reflect a size-contrast effect). When estimating after a delay, however, it appears that people ignore the size of the flanking objects entirely. This does not fit well with the results commonly found in visual experiments. Thus, introducing a delay reveals important differences in the way in which haptic and visual memories are stored and accessed.
Affiliations:
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Goodale</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Department of Psychology, University of Western Ontario</s1><s2>London, ON N6A 5C2</s2><s3>CAN</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>Canada</country><wicri:noRegion>London, ON N6A 5C2</wicri:noRegion></affiliation></author></analytic><series><title level="j" type="main">Experimental brain research</title><title level="j" type="abbreviated">Exp. brain res.</title><idno type="ISSN">0014-4819</idno><imprint><date when="2009">2009</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Experimental brain research</title><title level="j" type="abbreviated">Exp. brain res.</title><idno type="ISSN">0014-4819</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>After effect</term><term>Estimation</term><term>Gripping</term><term>Haptic perception</term><term>Memory</term><term>Optical illusion</term><term>Perceptual illusion</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Préhension</term><term>Illusion visuelle</term><term>Illusion perceptive</term><term>Estimation</term><term>Effet consécutif</term><term>Mémoire</term><term>Perception haptique</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Experiments with visual illusions have revealed a dissociation between the systems that mediate object perception and those responsible for object-directed action. More recently, an experiment on a haptic version of the visual size-contrast illusion has provided evidence for the notion that the haptic modality shows a similar dissociation when grasping and estimating the size of objects in real-time. Here we present evidence suggesting that the similarities between the two modalities begin to break down once a delay is introduced between when people feel the target object and when they perform the grasp or estimation. In particular, when grasping after a delay in a haptic paradigm, people scale their grasps differently when the target is presented with a flanking object of a different size (although the difference does not reflect a size-contrast effect). When estimating after a delay, however, it appears that people ignore the size of the flanking objects entirely. This does not fit well with the results commonly found in visual experiments. 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