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Kinematics of point-to-point finger movements

机译：点对点手指运动的运动学

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摘要

The goal of this study was to examine the characteristics of planar fingertip movements with respect to the hand. Ten subjects with no known neuromuscular impairments performed a series of point-to-point movements with their dominant index fingertips. Subjects were instructed to move between five pairs of targets within the workspace of the index finger in each direction, for a total of ten separate movement tasks. We hypothesized that the trajectories with respect to the hand of these movements would exhibit curved paths contrary to the findings of similar hand path studies. The ratio of the path taken to the straight-line distance between the two targets was dependent upon the movement task (P<0.01), as was the mean residual between the actual and straight-line paths (P<0.001). For selected pairs of targets, these values were significantly different for the two opposing movement directions between a given pair of targets. This directional dependence of the curvature of the chosen finger-only trajectory observed in the initial protocol is incompatible with motor planning based solely on kinematic constraints, instead mechanical properties of the finger are likely incorporated.
机译：这项研究的目的是检查相对于手的平面指尖运动的特征。十名没有已知神经肌肉损伤的受试者用其主要的食指进行了一系列的点对点运动。指示对象在食指的工作空间内沿每个方向在五对目标之间移动，总共执行十个单独的移动任务。我们假设这些动作相对于手的轨迹将呈现弯曲的路径，这与类似的手路径研究的发现相反。路径与两个目标之间的直线距离之比取决于运动任务（P <0.01），实际路径与直线路径之间的平均残差也一样（P <0.001）。对于选定的目标对，这些值对于给定目标对之间的两个相对运动方向而言是明显不同的。在初始协议中观察到的所选手指仅轨迹的曲率的这种方向依赖性与仅基于运动学约束的运动计划是不兼容的，而是可能合并了手指的机械特性。

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