Frak, Victor; Paulignan, Yves et Jeannerod, Marc (2001). « Orientation of the opposition axis in mentally simulated grasping ». Experimental Brain Research, 136(1), pp. 120-127.
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Résumé
Five normal subjects were tested in a simulated grasping task. A cylindrical container filled with water was placed on the center of a horizontal monitor screen. Subjects used a precision grip formed by the thumb and index finger of their right hand. After a preliminary run during which the container was present, it was replaced by an image of the upper surface of the cylinder appearing on the horizontal computer screen on which the real cylinder was placed during the preliminary run. In each trial the image was marked with two contact points which defined an opposition axis in various orientations with respect to the frontal plane. The subjects’ task consisted, once shown a stimulus, of judging as quickly as possible whether the previously experienced action of grasping the container full of water and pouring the water out would be easy, difficult or impossible with the fingers placed according to the opposition axis indicated on the circle. Response times were found to be longer for the grasps judged to be more difficult due to the orientation and position of the opposition axis. In a control experiment, three subjects actually performed the grasps with different orientations and positions of the opposition axis. The effects of these parameters on response time followed the same trends as during simulated movements. This result shows that simulated hand movements take into account the same biomechanical limitations as actually performed movements.
Type: | Article de revue scientifique |
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Mots-clés ou Sujets: | Motor imagery - Visuomotor transformation - Prehension - Opposition axis - Coordination |
Unité d'appartenance: | Faculté des sciences |
Déposé par: | Victor Frak |
Date de dépôt: | 18 mai 2010 13:15 |
Dernière modification: | 01 nov. 2014 02:14 |
Adresse URL : | http://archipel.uqam.ca/id/eprint/2960 |
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Orientation of the opposition axis in mentally simulated grasping. (déposé le 17 mai 2010 14:16)
- Orientation of the opposition axis in mentally simulated grasping. (déposé le 18 mai 2010 13:15) [Actuellement Affiché]
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