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Poor shape perception is the reason reaches-to-grasp are visually guided online

Identifieur interne : 005191 ( Main/Exploration ); précédent : 005190; suivant : 005192

Poor shape perception is the reason reaches-to-grasp are visually guided online

Auteurs : Young-Lim Lee [États-Unis] ; Charles E. Crabtree [États-Unis] ; J. Farley Norman [États-Unis] ; Geoffrey P. Bingham [États-Unis]

Source :

Perception & psychophysics [ 0031-5117 ] ; 2008.

RBID : Pascal:09-0059394

Descripteurs français

Pascal (Inist)
- Préhension, Mouvement corporel, Membre supérieur, Guidage visuomoteur, Etude expérimentale, Vision, Homme.
Wicri :
- topic : Homme.

English descriptors

KwdEn :
- Adult, Body movement, Experimental study, Form Perception, Gripping, Hand Strength, Human, Humans, Internet, Judgment, Upper limb, Vision, Visual Perception, Visuomotor tracking.
MESH :
- Adult, Form Perception, Hand Strength, Humans, Internet, Judgment, Visual Perception.

Abstract

Both judgment studies and studies of feedforward reaching have shown that the visual perception of object distance, size, and shape are inaccurate. However, feedback has been shown to calibrate feedfoward reaches-to-grasp to make them accurate with respect to object distance and size. We now investigate whether shape perception (in particular, the aspect ratio of object depth to width) can be calibrated in the context of reaches-to-grasp. We used cylindrical objects with elliptical cross-sections of varying eccentricity. Our participants reached to grasp the width or the depth of these objects with the index finger and thumb. The maximum grasp aperture and the terminal grasp aperture were used to evaluate perception. Both occur before the hand has contacted an object. In Experiments 1 and 2, we investigated whether perceived shape is recalibrated by distorted haptic feedback. Although somewhat equivocal, the results suggest that it is not. In Experiment 3, we tested the accuracy of feedforward grasping with respect to shape with haptic feedback to allow calibration. Grasping was inaccurate in ways comparable to findings in shape perception judgment studies. In Experiment 4, we hypothesized that online guidance is needed for accurate grasping. Participants reached to grasp either with or without vision of the hand. The result was that the former was accurate, whereas the latter was not. We conclude that shape perception is not calibrated by feedback from reaches-to-grasp and that online visual guidance is required for accurate grasping because shape perception is poor.

Affiliations:

Le document en format XML

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<front><div type="abstract" xml:lang="en">Both judgment studies and studies of feedforward reaching have shown that the visual perception of object distance, size, and shape are inaccurate. However, feedback has been shown to calibrate feedfoward reaches-to-grasp to make them accurate with respect to object distance and size. We now investigate whether shape perception (in particular, the aspect ratio of object depth to width) can be calibrated in the context of reaches-to-grasp. We used cylindrical objects with elliptical cross-sections of varying eccentricity. Our participants reached to grasp the width or the depth of these objects with the index finger and thumb. The maximum grasp aperture and the terminal grasp aperture were used to evaluate perception. Both occur before the hand has contacted an object. In Experiments 1 and 2, we investigated whether perceived shape is recalibrated by distorted haptic feedback. Although somewhat equivocal, the results suggest that it is not. In Experiment 3, we tested the accuracy of feedforward grasping with respect to shape with haptic feedback to allow calibration. Grasping was inaccurate in ways comparable to findings in shape perception judgment studies. In Experiment 4, we hypothesized that online guidance is needed for accurate grasping. Participants reached to grasp either with or without vision of the hand. The result was that the former was accurate, whereas the latter was not. We conclude that shape perception is not calibrated by feedback from reaches-to-grasp and that online visual guidance is required for accurate grasping because shape perception is poor.</div>
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Serveur d'exploration sur les dispositifs haptiques

Poor shape perception is the reason reaches-to-grasp are visually guided online

Poor shape perception is the reason reaches-to-grasp are visually guided online

Source :

Descripteurs français

English descriptors

Abstract

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

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri

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