Reaching beyond reach
Reaching beyond reach
复制标题
DOI：
10.1007/s002210050713
复制
发表时间：
1999-05-01
影响因子：
2
通讯作者：
Berthoz, A
中科院分区：
文献类型：
--
作者：
Flanders, M;Daghestani, L;Berthoz, A
对双关节伸展运动中的错误分析为感觉运动处理算法提供了线索。本研究将这一重点扩展到头部、躯干和腿部与手臂连接以帮助到达略超出手臂长度的目标的情况。受试者准确地达到触摸“真实的目标”或达到“虚拟目标”的记忆位置（即，在到达开始时移除的目标）。受试者在虚拟目标条件下犯了很大的错误，这些错误进行了分析，目的是揭示全身协调的影响。研究发现，受试者在虚拟目标条件下（与精确移动到真实的目标相比）头部旋转较少。这导致头部姿势的范围更加有限，并且运动结束时的最终头部角度与不正确的手位置在几何上相关，这可能是部分错误的原因。这表明，头-眼-手协调在这些运动的组织中起着重要的作用，并导致假设当前注视方向的表示可以作为手臂运动控制的参考信号。
The analysis of errors in two-joint reaching movements has provided clues about sensorimotor processing algorithms. The present study extends this focus to situations where the head, trunk, and legs join with the arm to help reach targets placed slightly beyond arm's length. Subjects reached accurately to touch "real targets" or reached to the remembered locations of "virtual targets" (i.e., targets removed at the start of the reach). Subjects made large errors in the virtual-target condition and these errors were analyzed with the aim of revealing the implications for whole-body coordination. Subjects were found to rotate the head less in the virtual-target condition (when compared with accurate movements to real targets). This resulted in a more limited range of head postures, and the final head angles at the end of the movements were geometrically related to the incorrect hand locations, perhaps accounting for some portion of the errors. This suggests that head-eye-hand coordination plays an important role in the organization of these movements and leads to the hypothesis that a representation of current gaze direction may serve as a reference signal for arm motor control.