VISUAL INFORMATION AND OBJECT SIZE IN THE CONTROL OF REACHING

Citation
Ne. Berthier et al., VISUAL INFORMATION AND OBJECT SIZE IN THE CONTROL OF REACHING, Journal of motor behavior, 28(3), 1996, pp. 187-197
Citations number
32
Categorie Soggetti
Psychology, Experimental",Psychology
Journal title
ISSN journal
00222895
Volume
28
Issue
3
Year of publication
1996
Pages
187 - 197
Database
ISI
SICI code
0022-2895(1996)28:3<187:VIAOSI>2.0.ZU;2-S
Abstract
The role of vision in the control of reaching and grasping was investi gated by varying the available visual information. Adults (N = 7) reac hed in conditions that had full visual information, visual information about the target object but not the hand or surrounding environment, and no visual information. Four different object diameters were used. The results indicated that as visual information and object size decre ased, subjects used longer movement times, had slower speeds, and more asymmetrical hand-speed profiles. Subjects matched grasp aperture to object diameter, but overcompensated with larger grasp apertures when visual information was reduced. Subjects also qualitatively differed i n reach kinematics when challenged with reduced visual information or smaller object size. These results emphasize the importance of vision of the target in reaching and show that subjects do not simply scale a command template with task difficulty.