The effect of visuomotor displacements on arm movement paths
The effect of visuomotor displacements on arm movement paths
复制标题
视觉运动位移对手臂运动路径的影响
作者：
S. Goodbody;D. Wolpert
在点对点的手臂运动中，平缓的弯曲路径被认为是由于计划的直线路径的不完美执行，或者是作为一种控制策略的紧急属性，其中依赖于手臂动力学的内在成本被最小化。我们使用虚拟视觉反馈系统来测试路径曲率主要是由视觉感知还是由运动肢体的实际位置决定的。在垂直和均匀翻译的视觉反馈下，测量了三对目标之间的手部运动路径。这让我们能够在运动过程中分离实际和感知到的手的位置。在不同的视觉反馈条件下，手的路径曲率与肢体的视觉感知位置和实际位置无关，而与肢体的实际位置和视觉感知位置之间的相对位移有关。结果与在规划运动时固有坐标（如关节角）的内部估计至少部分来自视觉信息的假设是一致的。
Abstract The gently curved paths evident in point-to-point arm movements have been attributed to both an imperfect execution of a planned straight-hand path or as an emergent property of a control strategy in which an intrinsic cost, dependent on arm dynamics, is minimised. We used a virtual visual feedback system to test whether path curvature was mainly determined by the visually perceived or actual location of the moving limb. Hand paths were measured for movements between three pairs of targets under both veridical and uniformly translated visual feedback. This allowed us to decouple the actual and perceived hand location during movement. Under different conditions of visual feedback the curvature of the hand paths did not correlate with either the visually perceived location of the limb or the actual location but rather with the relative displacement between the actual and visually perceived limb locations. The results are consistent with the hypothesis that in planning a movement the internal estimate of intrinsic coordinates, such as joint angles, is at least partially derived from visual information.
DOI：
10.1073/pnas.93.9.3843
发表时间：
1996-04-30
影响因子：
11.1
作者：
Gandolfo, F;MussaIvaldi, FA;Bizzi, E
通讯作者：
Bizzi, E
影响因子：
2.5
作者：
GORDON, J;GHILARDI, MF;GHEZ, C
通讯作者：
GHEZ, C
影响因子：
2.5
作者：
GHEZ, C;GORDON, J;GHILARDI, MF
通讯作者：
GHILARDI, MF