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Remote responses to perturbation in human prehension.
Neuroscience Letters
|January 14, 1991
Summary
This study reveals how hand transport and aperture control coordinate during reaching and grasping. Compensatory adjustments in aperture help maintain prehension stability despite unexpected arm perturbations.
Area of Science:
- Neuroscience
- Biomechanics
- Motor Control
Background:
- Reaching and grasping movements involve complex coordination of hand transport and aperture.
- Understanding this coordination is crucial for fields like robotics and rehabilitation.
Purpose of the Study:
- To investigate the coordination between hand transport and hand aperture control during reaching and grasping.
- To examine how the motor system compensates for perturbations affecting hand transport.
Main Methods:
- Subjects performed reaching and grasping movements while a mechanical actuator introduced perturbations.
- Hand transport and aperture were recorded during perturbed and unperturbed trials.
Main Results:
- Mechanical perturbations to hand transport elicited immediate compensatory adjustments in hand aperture.
- The spatial and temporal characteristics of these adjustments were invariant, suggesting a coordinated control system.
Conclusions:
- The findings suggest a tightly coupled control system for hand transport and aperture during prehension.
- This coordination likely ensures stable and effective grasping despite external disturbances.