A haptic size-contrast illusion affects size perception but not grasping
Identifieur interne : 007532 ( Main/Merge ); précédent : 007531; suivant : 007533A haptic size-contrast illusion affects size perception but not grasping
Auteurs : David A. Westwood [Canada] ; Melvyn A. Goodale [Canada]Source :
- Experimental brain research [ 0014-4819 ] ; 2003.
Descripteurs français
- Pascal (Inist)
- Wicri :
- topic : Homme.
English descriptors
- KwdEn :
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.
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Pascal:04-0163519Le document en format XML
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<term>Human</term>
<term>Manual task</term>
<term>Motor control</term>
<term>Perceptual illusion</term>
<term>Size</term>
<term>Vision</term>
<term>Visual perception</term>
<term>Visuomotor control</term>
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<keywords scheme="Pascal" xml:lang="fr"><term>Préhension</term>
<term>Tâche manuelle</term>
<term>Perception visuelle</term>
<term>Vision</term>
<term>Main</term>
<term>Illusion perceptive</term>
<term>Taille</term>
<term>Contrôle moteur</term>
<term>Contrôle visuomoteur</term>
<term>Homme</term>
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<front><div type="abstract" xml:lang="en">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.</div>
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