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首页> 外文期刊>Journal of Neurophysiology >A preferred pattern of joint coordination during arm movements with redundant degrees of freedom
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A preferred pattern of joint coordination during arm movements with redundant degrees of freedom

机译：具有冗余自由度的手臂运动期间关节协调的首选方式

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Redundancy of degrees of freedom (DOFs) during natural human movements is a central problem of motor control research. This study tests a novel interpretation that during arm movements, the DOF redundancy is used to support a preferred, simplified joint control pattern that consists of rotating either the shoulder or elbow actively and the other (trailing) joint predominantly passively by interaction and gravitational torques. We previously revealed the preference for this control pattern during nonredundant horizontal arm movements. Here, we studied whether this preference persists during movements with redundant DOFs and the redundancy is used to enlarge the range of directions in which this control pattern can be utilized. A free-stroke drawing task was performed that involved production of series of horizontal center-out strokes in randomly selected directions. Two conditions were used, with the arm's joints unconstrained (U) and constrained (C) to the horizontal plane. In both conditions, directional preferences were revealed and the simplified control pattern was used in the preferred and not in nonpreferred directions. The directional preferences were weaker and the range of preferred directions was wider in the U condition, with higher percentage of strokes performed with the simplified control pattern. This advantage was related to the usage of additional DOFs. We discuss that the simplified pattern may represent a feedforward control strategy that reduces the challenge of joint coordination caused by signal-dependent noise during movement execution. The results suggest a possibility that the simplified pattern is used during the majority of natural, seemingly complex arm movements.
机译：人体自然运动过程中的自由度（DOF）冗余是电机控制研究的中心问题。这项研究测试了一种新颖的解释，即在手臂运动期间，自由度冗余用于支持一种优选的简化关节控制模式，该模式包括通过交互作用和重力扭矩主动地旋转肩膀或肘部，而另一个（尾部）关节则主要被动地旋转。先前，我们显示了在非冗余的水平臂移动过程中对这种控制模式的偏爱。在这里，我们研究了在带有冗余自由度的运动过程中这种偏好是否仍然存在，并且使用冗余来扩大可利用此控制模式的方向范围。执行了自由笔划绘图任务，该任务涉及在随机选择的方向上生成一系列水平居中笔画。使用了两个条件，即手臂的关节在水平面上不受约束（U），在关节上受约束（C）。在这两种情况下，都显示出方向性偏好，并且简化的控制模式用于首选而非非首选方向。在U条件下，方向性偏好更弱，首选方向的范围更广，使用简化控制模式执行的笔划百分比更高。此优势与使用其他自由度有关。我们讨论简化的模式可能代表一种前馈控制策略，该策略可减少运动执行过程中因信号相关的噪声而引起的关节协调的挑战。结果表明在大多数自然的，看似复杂的手臂运动中使用简化模式的可能性。

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