Manual obstacle avoidance takes into account visual uncertainty, motor noise, and biomechanical costs
Manual obstacle avoidance takes into account visual uncertainty, motor noise, and biomechanical costs
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DOI：
10.1007/s00221-009-2042-8
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发表时间：
2010-03-01
影响因子：
2
通讯作者：
Rosenbaum, David A.
中科院分区：
文献类型：
--
作者：
Cohen, Rajal G.;Biddle, Jason C.;Rosenbaum, David A.
在障碍物周围移动需要平衡避免碰撞的需要和最小化生物力学成本的需要。我们通过研究视觉不确定性、电机噪声和手动定位任务中的障碍物间隙练习的影响来研究这种权衡。参与者在一个固定的障碍物上来回移动一个机械臂。我们通过将障碍物放置在相对于参与者眼睛的不同高度来改变视觉不确定性，并且通过让参与者在相对于手臂关节运动范围的不同位置握住要移动的对象来改变电机噪声。间隙较大的条件下，较高的视觉不确定性比条件下的视觉不确定性较低，较大的电机噪声条件下比在较低的电机噪声条件下，较大的早期实践中比后期实践中。结果表明，空间精度和生物力学成本都考虑到在达到超过障碍物，但在不同程度的实践。
Moving around obstacles requires balancing the need to avoid collisions with the need to minimize biomechanical costs. We investigated this tradeoff by studying the effects of visual uncertainty, motor noise, and practice on clearance over obstacles in a manual positioning task. Participants moved a manipulandum back and forth over a stationary obstacle. We varied visual uncertainty by placing the obstacle at different heights relative to participants' eyes, and we varied motor noise by having participants hold the object to be moved at different positions relative to the range of motion of the arm joints. Clearance was larger in conditions of higher visual uncertainty than in conditions of lower visual uncertainty, larger in the higher motor noise conditions than in the lower motor noise conditions, and larger early in practice than late in practice. The results indicate that spatial accuracy and biomechanical costs are both taken into account during reaching over obstacles, but to differing degrees across practice.