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Neurosci Lett. 2000 Mar 3;281(1):53-6.

Pointing to a target from an upright position in human: tuning of postural responses when there is target uncertainty.

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  • 1Universit√© de Bourgogne, UFR STAPS, BP 27877, 21078, Dijon, France. omartin@u-bourgogne.fr


Human subjects performed, from a standing position, rapid hand pointings to visual targets located within or beyond the prehension space. To examine the interaction between posture and the goal-directed movement we introduced a visual double-step perturbation requiring a reprogramming of the hand movement. Trials directed towards the same spatial goal but differentiated only by the likeliness of a visual double-step were compared. The hand kinematics was not affected by the uncertainty of the visual perturbation; an increased trunk bending, however, was observed. This suggests that uncertainty constraints are integrated in a predictive manner for the optimal coordination of the hand and postural control systems.

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