Perceptual basis of bimanual coordination
Perceptual basis of bimanual coordination
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DOI：
10.1038/35102060
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发表时间：
2001-11-01
期刊：
影响因子：
64.8
通讯作者：
Prinz, W
中科院分区：
文献类型：
--
作者：
Mechsner, F;Kerzel, D;Prinz, W
周期性的双手运动往往是人类行为基本组织原则研究的焦点（1-25）。在这种运动中，有一种典型的自发倾向于镜像对称。甚至会无意识地从不对称的运动模式滑向对称，而不是相反。传统上，这种现象被解释为同源肌肉的共同激活趋势，可能起源于运动神经元结构。在这里，我们提供了与这种普遍假设相反的证据。我们展示了两个重要的实验模型——双手手指振荡(1)和双手四指敲击(2)——对称性偏差实际上倾向于空间的、感知的对称性，而不考虑涉及的肌肉。我们认为这种自发协调现象在本质上纯粹是感性的。在双手盘旋模型的情况下，我们的研究结果表明，高度复杂的，甚至是“不可能”的动作可以很容易地完成，只有简单的视觉反馈。所执行的知觉振荡模式的“运动”表示是不必要的。因此，没有必要将这种“动力”转化为“感知”表征，反之亦然，使用“内部模型”（参考29）。我们认为，自愿运动是通过感知目标的表征来组织的，而相应的运动活动，有时是高度复杂的，是自发和灵活的。
Periodic bimanual movements are often the focus of studies of the basic organizational principles of human actions(1-25). In such movements there is a typical spontaneous tendency towards mirror symmetry. Even involuntary slips from asymmetrical movement patterns into symmetry occur, but not vice versa. Traditionally, this phenomenon has been interpreted as a tendency towards co-activation of homologous muscles, probably originating in motoric neuronal structures. Here we provide evidence contrary to this widespread assumption. We show for two prominent experimental models-bimanual finger oscillation(1) and bimanual four-finger tapping(2)-that the symmetry bias is actually towards spatial, perceptual symmetry, without regard to the muscles involved. We suggest that spontaneous coordination phenomena of this kind are purely perceptual in nature. In the case of a bimanual circling model, our findings reveal that highly complex, even 'impossible' movements can easily be performed with only simple visual feedback. A 'motoric' representation of the performed perceptual oscillation patterns is not necessary. Thus there is no need to translate such a 'motoric' into a 'perceptual' representation or vice versa, using 'internal models' (ref. 29). We suggest that voluntary movements are organized by way of a representation of the perceptual goals, whereas the corresponding motor activity, of sometimes high complexity, is spontaneously and flexibly tuned in.