Influence of visual constraints in the trajectory formation of grasping movements

• Published in: Neuroscience letters Vol. 401; no. 1; pp. 97 - 102
• Main Authors: Palluel-Germain, R., Boy, F., Orliaguet, J.P., Coello, Y.
• Format: Journal Article
• Language: English
• Published: Shannon Elsevier Ireland Ltd 19.06.2006; Elsevier
• Subjects: Adolescent; Adult; Biological and medical sciences; Brain - physiology; Cognitive science; Context effect; Eye and associated structures. Visual pathways and centers. Vision; Feedback - physiology; Fingers - innervation; Fingers - physiology; Fundamental and applied biological sciences. Psychology; Hand - innervation; Hand - physiology; Hand Strength - physiology; Humans; Models, Neurological; Motor control and motor pathways. Reflexes. Control centers of vegetative functions. Vestibular system and equilibration; Motor planning; Movement - physiology; Natural grasp; Neuropsychological Tests; Observer Variation; Orientation - physiology; Photic Stimulation; Psychology; Psychomotor Performance - physiology; Space Perception - physiology; User-Computer Interface; Vertebrates: nervous system and sense organs; Video-controlled movements; Visual feedback; Natural grasp; Motor planning; Visual feedback; Video-controlled movements; Context effect; Context; Gripping; Feedback regulation; Vision; Body movement; Perception; Upper limb; Planning; Motricity
• ISSN: 0304-3940; 1872-7972
• DOI: 10.1016/j.neulet.2006.02.072

The main objective of the present study is to show that the visual context can influence the trajectory formation of grasping movements. We asked participants to reach and grasp a cylinder disposed at three different positions: −20°, 0° and 20° of eccentricity with respect to the midsagittal axis. Grasping movements were performed in a direct and in an indirect visual feedback condition (i.e., controlled through a vertical video display). Results revealed that for grasping movements directed toward objects located at −20° and 0°, path curvatures of the wrist, the thumb and the index finger were significantly straighter in the indirect visual feedback condition. However, no significant difference concerning hand path curvature was observed when the movement was directed toward the object located at 20°. This suggests that grasping movements controlled through a remote visual feedback tend to be planned in extrinsic space and that the effect of the visual context on movement planning appears to be not isotropic over the workspace.