Prehension movements in a patient (AC) with posterior parietal cortex damage and posterior callosal section

Frak, Victor; Paulignan, Yves; Jeannerod, Marc; Michel, François et Cohen, Henri (2006). « Prehension movements in a patient (AC) with posterior parietal cortex damage and posterior callosal section ». Brain and Cognition, 60, pp. 43-48.

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Résumé

Prehension movements of the right hand were recorded in a right-handed man (AC), with an injury to the left posterior parietal cortex (PPC) and with a section of the left half of the splenium. The kinematic analysis of AC’s grasping movements in direct and perturbed con- ditions was compared to that of Wve control subjects. A novel eVect in prehension was revealed—a hemispace eVect—in healthy controls only. Movements to the left hemispace were faster, longer, and with a smaller grasp aperture; perturbation of both object position and distance resulted in the attenuation of the direction eVect on movement time and the time to velocity peak, with a reverse pattern in the time to maximum grip aperture. Nevertheless, the correlation between transport velocity amplitude and grasp aperture remained stable in both perturbed and non-perturbed movements, reXecting the coordination between reaching and grasping in control subjects. In contrast, transport and grasp, as well as their coordination in both direct and perturbed conditions, were negatively aVected by the PPC and sple- nium lesion in AC, suggesting that transport and grasp rely on two functionally identiWable subsystems.

Type:	Article de revue scientifique
Mots-clés ou Sujets:	Posterior parietal cortex; Prehension; Visuomotor channels; Callosal section
Unité d'appartenance:	Faculté des sciences
Déposé par:	Victor Frak
Date de dépôt:	17 mai 2010 14:22
Dernière modification:	01 nov. 2014 02:14
Adresse URL :	http://archipel.uqam.ca/id/eprint/2941

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