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首页> 外文期刊>The European Journal of Neuroscience >Independent on-line control of the two hands during bimanual reaching.
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Independent on-line control of the two hands during bimanual reaching.

机译：在双手到达时，两只手的独立在线控制。

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摘要

Many studies on bimanual coordination have shown that people exhibit a preference for mirror-symmetric movements. We demonstrate that this constraint is absent when bimanual reaching movements are made to visual targets. We investigated the ability of humans to make on-line adjustments during such movements when one or both targets were displaced during the initial phase of the movements. Adjustments were as efficient during bimanual as unimanual movements, even when two adjustments had to be made simultaneously. When one target was displaced in the bimanual condition, the hand reaching to that target adjusted efficiently to the displacement. However, a small transient perturbation in the trajectory of the other hand was also observed. This perturbation was in the same direction as the displacement, rather than in mirror-symmetric direction. A control experiment demonstrated that these perturbations could be elicited by visual information alone, but that they were also influenced by whether an adjustment was required in the trajectory of the other hand. Our results demonstrate near independent control of the two arms during visually guided reaching. The subtle interference observed between the arms reflects interactions between target-related representations in visual coordinates rather than between movement-related representations in joint- or muscle-coordinates.
机译：关于双手协调的许多研究表明，人们表现出对镜像对称运动的偏爱。我们证明了当对视觉目标进行双向移动时，这种约束是不存在的。我们研究了在运动的初始阶段，当一个或两个目标都被移动时，人类在此类运动中进行在线调整的能力。即使在必须同时进行两次调整的情况下，调整在两手操作中的效率一样高。当一个目标在双手状态下发生位移时，到达该目标的手会有效地适应位移。但是，在另一只手的轨迹上也观察到了一个小的瞬态扰动。这种扰动与位移的方向相同，而不是镜像对称的方向。对照实验表明，这些干扰只能由视觉信息引起，但它们的影响还受到另一只手的轨迹是否需要调整的影响。我们的结果表明，在视觉引导的到达过程中，两个手臂几乎独立控制。手臂之间观察到的细微干扰反映了视觉坐标中与目标相关的表示之间的交互，而不是关节或肌肉坐标中与运动相关的表示之间的交互。

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