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Adaptation of grasping responses to distorted object size and orientation.

Identifieur interne : 001684 ( PubMed/Curation ); précédent : 001683; suivant : 001685

Adaptation of grasping responses to distorted object size and orientation.

Auteurs : Cornelia Weigelt [Allemagne] ; Otmar Bock

Source :

Experimental brain research [ 1432-1106 ] ; 2007.

RBID : pubmed:17333005

English descriptors

KwdEn :
- Adaptation, Physiological (physiology), Adult, Analysis of Variance, Biomechanical Phenomena, Female, Hand Strength (physiology), Humans, Male, Middle Aged, Orientation, Psychomotor Performance (physiology), Reaction Time (physiology), Size Perception (physiology), Task Performance and Analysis.
MESH :
- physiology : Adaptation, Physiological, Hand Strength, Psychomotor Performance, Reaction Time, Size Perception.
- Adult, Analysis of Variance, Biomechanical Phenomena, Female, Humans, Male, Middle Aged, Orientation, Task Performance and Analysis.

Abstract

The present study investigated the adaptive plasticity of the grasp component of prehensile movements. Subjects saw visual objects (V) of various sizes and orientations and were instructed to seize them with the thumb and index finger without manipulating them. The subjects' hand disappeared from view during the response and made contact with a haptic object (H), which could differ with respect to size or orientation from V. In Experiment A, we found that the grasp aperture adaptively increased when H > V and decreased when H < V. This confirms earlier observations and expands them by documenting that grasp size adaptation occurs even when grasping is not integrated into an intentional behavioral context (i.e., object manipulation). However, the magnitude of the observed adaptive size change was not monotonously related to the visual-haptic size difference, as one would expect for an adequate adaptive response. In Experiment B, we observed for the first time that the orientation of the grasp aperture adaptively changed when H was differently oriented than V. This change generalized to an unpracticed size and orientation of V, even in the absence of confirmative haptic feedback about dowel orientation. This outcome indicates that grasp orientation adaptation was at least partly based on the recalibration of sensory-to-motor transformation rules, rather than being completely due to strategic adjustments.

DOI: 10.1007/s00221-007-0911-6
PubMed: 17333005

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Le document en format XML

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<author><name sortKey="Weigelt, Cornelia" sort="Weigelt, Cornelia" uniqKey="Weigelt C" first="Cornelia" last="Weigelt">Cornelia Weigelt</name>
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<wicri:regionArea>Institute of Physiology and Anatomy, German Sport University, 50927, Köln</wicri:regionArea>
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<front><div type="abstract" xml:lang="en">The present study investigated the adaptive plasticity of the grasp component of prehensile movements. Subjects saw visual objects (V) of various sizes and orientations and were instructed to seize them with the thumb and index finger without manipulating them. The subjects' hand disappeared from view during the response and made contact with a haptic object (H), which could differ with respect to size or orientation from V. In Experiment A, we found that the grasp aperture adaptively increased when H > V and decreased when H < V. This confirms earlier observations and expands them by documenting that grasp size adaptation occurs even when grasping is not integrated into an intentional behavioral context (i.e., object manipulation). However, the magnitude of the observed adaptive size change was not monotonously related to the visual-haptic size difference, as one would expect for an adequate adaptive response. In Experiment B, we observed for the first time that the orientation of the grasp aperture adaptively changed when H was differently oriented than V. This change generalized to an unpracticed size and orientation of V, even in the absence of confirmative haptic feedback about dowel orientation. This outcome indicates that grasp orientation adaptation was at least partly based on the recalibration of sensory-to-motor transformation rules, rather than being completely due to strategic adjustments.</div>
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<Abstract><AbstractText>The present study investigated the adaptive plasticity of the grasp component of prehensile movements. Subjects saw visual objects (V) of various sizes and orientations and were instructed to seize them with the thumb and index finger without manipulating them. The subjects' hand disappeared from view during the response and made contact with a haptic object (H), which could differ with respect to size or orientation from V. In Experiment A, we found that the grasp aperture adaptively increased when H > V and decreased when H < V. This confirms earlier observations and expands them by documenting that grasp size adaptation occurs even when grasping is not integrated into an intentional behavioral context (i.e., object manipulation). However, the magnitude of the observed adaptive size change was not monotonously related to the visual-haptic size difference, as one would expect for an adequate adaptive response. In Experiment B, we observed for the first time that the orientation of the grasp aperture adaptively changed when H was differently oriented than V. This change generalized to an unpracticed size and orientation of V, even in the absence of confirmative haptic feedback about dowel orientation. This outcome indicates that grasp orientation adaptation was at least partly based on the recalibration of sensory-to-motor transformation rules, rather than being completely due to strategic adjustments.</AbstractText>
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Adaptation of grasping responses to distorted object size and orientation.

Adaptation of grasping responses to distorted object size and orientation.

Source :

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Links to Exploration step

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

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Pour générer des pages wiki