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首页> 外文期刊>Brain and cognition >Bimanual reaching across the hemispace: Which hand is yoked to which?
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Bimanual reaching across the hemispace: Which hand is yoked to which?

机译：两手跨过半空间：哪只手被束缚在哪只手上？

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摘要

When both hands perform concurrent goal-directed reaches, they become yoked to one another. To investigate the direction of this coupling (i.e., which hand is yoked to which), the temporal dynamics of bimanual reaches were compared with equivalent-amplitude unimanual reaches. These reaches were to target pairs located on either the left or right sides of space; meaning that in the bimanual condition, one hand's contralateral (more difficult) reach accompanied by the other hand's ipsilateral (easier) reach. By comparing which hand's difficult reach was improved more by the presence of the other hand's easier ipsilateral reach, we were able to demonstrate asymmetries in the coupling. When the cost of bimanual reaching was controlled for the contralateral reaching left hand's performance was improved, suggesting that the left hand is yoked to the right during motor output. In contrast, the right hand showed the greatest improvements for contralateral reaching in terms of reaction time, pointing toward a dominant role for the left hand in the processes prior to movement onset. The results may point toward a mechanism for integrating the unitary system of attention with bimanual coordination.
机译：当两只手同时执行目标导向的到达时，它们会相互轭住。为了研究这种耦合的方向（即，哪只手被束缚在哪只手上），将两手到达的时间动态与等幅单手到达进行了比较。这些目标是针对位于空间左侧或右侧的对；表示在双手状态下，一只手的对侧（较困难）触及另一只手的同侧（较容易触及）。通过比较另一只手较容易的同侧伸手可以更好地改善哪只手的伸手不及力，我们可以证明耦合的不对称性。当控制了双手伸手的成本时，对侧伸手的性能得到了改善，这表明在输出电机时，左手被到右侧。相比之下，就反应时间而言，右手对侧伸肌显示出最大的进步，表明左手在运动开始之前的过程中起着主导作用。结果可能指向一种将注意力集中系统与双手协调相结合的机制。

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