Pointing to a target from an upright position in human: tuning of postural responses when there is target uncertainty.
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.
Martin
O
O
Université de Bourgogne, UFR STAPS, BP 27877, 21078, Dijon, France. omartin@u-bourgogne.fr
Teasdale
N
N
Simoneau
M
M
Corbeil
P
P
Bourdin
C
C
D000328:Adult; D004576:Electromyography; D005385:Fingers / Q000294:innervation; D006225:Hand / Q000294:innervation; D006801:Humans; D008297:Male; D010775:Photic Stimulation; D011187:Posture / Q000502:physiology*; D011434:Proprioception / Q000502:physiology*; D011597:Psychomotor Performance / Q000502:physiology; D014796:Visual Perception / Q000502:physiology