HUMAN ARM TRAJECTORY FORMATION
HUMAN ARM TRAJECTORY FORMATION
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DOI：
10.1093/brain/105.2.331
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发表时间：
1982-01-01
期刊：
影响因子：
14.5
通讯作者：
MORASSO, P
中科院分区：
文献类型：
--
作者：
ABEND, W;BIZZI, E;MORASSO, P
为了研究用于规划和控制多关节手臂轨迹的策略，记录了正常成年人的两自由度手臂动作。只有肩关节和肘关节处于活动状态。当受试者被告知简单地将他的手从一个视觉目标移动到另一个视觉目标时，手的路径大致是直的，他们直线轨迹的手速轮廓是钟形的。当受试者被要求产生弯曲的手部轨迹时，路径通常具有分段的外观，就像受试者试图近似具有低曲率元素的曲线一样。与弯曲轨迹相关联的手速曲线包含速度谷或拐点，这些速度谷或拐点在时间上与轨迹曲率中的局部最大值相关联。弯曲运动的平均持续时间长于直线运动的平均持续时间。从起源于机械臂控制和生物电机控制领域的轨迹控制理论的角度对这些结果进行了讨论。对这一结果提供了三种解释。
In order to investigate the strategies used to plan and control multijoint arm trajectories, two-degrees-of-freedom arm movements performed by normal adult humans were recorded. Only the shoulder and elbow joints were active. When a subject was told simply to move his hand from one visual target to another, the path of the hand was roughly straight, and the hand speed profile of their straight trajectories was bell-shaped. When the subject was required to produce curved hand trajectories, the path usually had a segmented appearance, as if the subject was trying to approximate a curve with low curvature elements. Hand speed profiles associated with curved trajectories contained speed valleys or inflections which were temporally associated with the local maxima in the trajectory curvature. The mean duration of curved movements was longer than the mean for straight movements. These results are discussed in terms of trajectory control theories which have originated in the fields of mechanical manipulator control and biological motor control. Three explanations for the results are offered.