A haptic size-contrast illusion affects size perception but not grasping.
Identifieur interne : 000399 ( Ncbi/Checkpoint ); précédent : 000398; suivant : 000400A haptic size-contrast illusion affects size perception but not grasping.
Auteurs : David A. Westwood [Canada] ; Melvyn A. GoodaleSource :
- Experimental brain research [ 0014-4819 ] ; 2003.
English descriptors
- KwdEn :
- MESH :
- physiology : Hand, Hand Strength, Illusions, Psychomotor Performance, Space Perception.
- Adult, Female, Humans, Male, Psychophysics.
Abstract
Object features (e.g. size, shape and orientation) are relevant for recognition and identification, but also for the control of manual actions. Converging evidence suggests a dissociation between the visual systems that mediate object perception and object-directed action. Here we present evidence suggesting that a similar dissociation might exist in the haptic domain. We demonstrate that a haptic variation of a size-contrast illusion influences the perceived size of a target object, but not the degree to which the hand is opened when that object is the target of a grasping movement. This finding is consistent with the view that object perception is "scene-based" and takes into consideration not only the size of the target object but also the sizes of other nearby objects. In contrast, the control of object-directed action is primarily driven by the absolute size of the target object independent of the relative sizes of other objects in the environment, suggesting a "actor-based" frame of reference. The present findings suggest that dissociations between action and perception are not unique to the visual system, but might instead reflect a general organizational principle of sensory processing.
DOI: 10.1007/s00221-003-1599-x
PubMed: 12898086
Affiliations:
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Westwood</name><affiliation wicri:level="1"><nlm:affiliation>School of Health and Human Performance, Dalhousie University, 6230 South Street, Halifax, Nova Scotia, B3H 3J5, Canada. David.Westwood@dal.ca</nlm:affiliation><country xml:lang="fr">Canada</country><wicri:regionArea>School of Health and Human Performance, Dalhousie University, 6230 South Street, Halifax, Nova Scotia, B3H 3J5</wicri:regionArea><wicri:noRegion>B3H 3J5</wicri:noRegion></affiliation></author><author><name sortKey="Goodale, Melvyn A" sort="Goodale, Melvyn A" uniqKey="Goodale M" first="Melvyn A" last="Goodale">Melvyn A. 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Converging evidence suggests a dissociation between the visual systems that mediate object perception and object-directed action. Here we present evidence suggesting that a similar dissociation might exist in the haptic domain. We demonstrate that a haptic variation of a size-contrast illusion influences the perceived size of a target object, but not the degree to which the hand is opened when that object is the target of a grasping movement. This finding is consistent with the view that object perception is "scene-based" and takes into consideration not only the size of the target object but also the sizes of other nearby objects. In contrast, the control of object-directed action is primarily driven by the absolute size of the target object independent of the relative sizes of other objects in the environment, suggesting a "actor-based" frame of reference. The present findings suggest that dissociations between action and perception are not unique to the visual system, but might instead reflect a general organizational principle of sensory processing.</div></front></TEI><affiliations><list><country><li>Canada</li></country></list><tree><noCountry><name sortKey="Goodale, Melvyn A" sort="Goodale, Melvyn A" uniqKey="Goodale M" first="Melvyn A" last="Goodale">Melvyn A. Goodale</name></noCountry><country name="Canada"><noRegion><name sortKey="Westwood, David A" sort="Westwood, David A" uniqKey="Westwood D" first="David A" last="Westwood">David A. Westwood</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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