Joint control strategies and hand trajectories in multijoint pointing movements.
Joint control strategies and hand trajectories in multijoint pointing movements.
复制标题
多关节指向运动中的关节控制策略和手部轨迹。
DOI：
--
复制
发表时间：
1986
影响因子：
1.4
通讯作者：
A. Gentile
中科院分区：
文献类型：
--
作者：
T. Kaminski;A. Gentile
评估了定时在多关节指向运动控制中的作用。8名受试者对不同的目标位置进行快速的指向运动。受试者的右臂被绑在一个2自由度的操纵臂上，允许肩膀和肘部在水平面上运动。改变手的初始和最终位置以及位移的大小，以确定对定时特性的影响。分析了肩部、肘部和手部的运动学和动力学。观察到的手部路径和速度分布与先前的报告一致。运动学变量的多元回归分析表明，关节运动开始的时间与手的初始位置和最终位置无关，但与关节位移线性相关：移动得更远的关节先开始运动。使用计算机模拟创建关节运动开始时间，与观察到的时间不同总是导致手的路径曲率增加和平滑速度曲线的损失。其次，在肘关节和肩关节的峰值速度和位移之间观察到非常稳定的线性关系。这种关系不受移动空间变化的影响。我们建议采用基于关节位移差的时空变换来调节关节运动开始的时间。仿真结果表明，这种变换可以产生平滑的速度剖面。运动开始时间与位移的关系、峰值速度与位移的关系是相辅相成的：通过保持速度与位移的线性关系，可以利用线性时空变换来控制时间。此外，这些关系可能用于简化运动关节之间的协调。
The role of timing in the control of multijoint pointing movements was evaluated. Eight subjects performed rapid pointing movements to a variety of target locations. The subject's right arm was strapped to a 2 degrees of freedom manupilandum that permitted shoulder and elbow motion in the horizontal plane. Initial and final position of the hand and magnitude of displacement was varied to determine effects on timing characteristics. Kinematics and kinetics of the shoulder, elbow, and hand were analyzed. The hand paths and velocity profiles observed were consistent with prior reports. Multiple regression analysis of kinematic variables disclosed that timing of joint movement onset was independent of initial and final positions of the hand, but was linearly related to joint displacement: the joint that moved farther started moving first. Using computer simulations to create joint movement onset, times that were different from the observed ones always resulted in hand paths with increased curvatures and loss of the smooth velocity profiles. Secondly, a very stable, linear relationship was observed between peak velocity and displacement at both the elbow and shoulder joints. This relationship was not affected by variations in movement space. We suggest that space-time transformation based on difference in joint displacement is used to regulated timing of joint movement onset. The simulations indicate that this transformation is set to produce smooth velocity profiles. The relationships between timing of movement onset and displacement and between peak velocity and displacement complement each other: by maintaining a linear relationship between velocity and displacement, a linear space time transformation can be used to control timing. Furthermore, these relationships are probably used to simplify coordination between the moving joints.
影响因子：
14.5
作者：
ABEND, W;BIZZI, E;MORASSO, P
通讯作者：
MORASSO, P
影响因子：
2.5
作者：
GEORGOPOULOS, AP;KALASKA, JF;MASSEY, JT
通讯作者：
MASSEY, JT