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首页> 外文会议>2014 40th Annual Northeast Bioengineering Conference >Extrinsic contributions to movement variability in human object manipulation
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Extrinsic contributions to movement variability in human object manipulation

机译：外在因素对人为对象操作中的运动可变性的贡献

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Human movements vary across repetitions and the structure of this variability can shed light on motor control and learning. Previous studies showed that humans adapt their movements to minimize the effect of their intrinsic variability on the task goal. This study shows that in complex object manipulation there are also extrinsic contributions to variability from the deterministic nonlinear object dynamics that add to the resultant variability in human movements. This extrinsic contribution has two distinct components: the sensitivity of the movement to the object's states and the sensitivity to the interaction forces between hand and object. The hypothesis is that humans adapt to this variability, similar as to their intrinsic variability. This hypothesis is tested in a task that mimics the action of carrying a cup of coffee. The cup of coffee is simplified to a ball rolling in a 2D arc and modeled with cart-and-pendulum dynamics. To test the hypothesis, experimental data from 9 subjects were analyzed, who manipulated the complex object in a virtual environment. The two sensitivity measures were parametrically derived from the cart-and-pendulum model and were then evaluated numerically using the experimentally observed states of the system. Results showed that movement variability decreased with practice, mirroring the decrease in one sensitivity measure. This coincidence is consistent with the hypothesis that these extrinsic contributions affect the movement variability. Although causation cannot be shown, it is regarded important to quantify these extrinsic contributors to movement variability in order to understand the control of manipulation of objects with complex dynamics.
机译：人体运动在重复过程中会发生变化，并且这种变化的结构可以为运动控制和学习提供启发。先前的研究表明，人类会调整自己的动作以最大程度地减少内在变异性对任务目标的影响。这项研究表明，在复杂的对象操纵中，确定性非线性对象动力学还对可变性产生了外部影响，从而增加了人体运动的最终可变性。这种外部贡献有两个不同的组成部分：运动对物体状态的敏感性和对手与物体之间相互作用力的敏感性。假设是人类适应这种可变性，就像他们的固有可变性一样。该假设在模仿携带一杯咖啡的行为的任务中得到检验。这杯咖啡简化为2D弧线滚动的球，并具有推车和摆锤动力学模型。为了检验假设，分析了9位受试者的实验数据，他们在虚拟环境中操纵了复杂的物体。这两个灵敏度测量值是从车和摆模型中参数得出的，然后使用实验观察到的系统状态进行数值评估。结果表明，运动变异性随实践而降低，反映出一种敏感性测量值的降低。这些巧合与这些外部影响影响运动变异性的假设是一致的。尽管无法显示因果关系，但量化这些外部因素对运动可变性的作用很重要，以便了解具有复杂动力学的对象的操纵控制。

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