Kinematic analysis of the human wrist during pointing tasks
Kinematic analysis of the human wrist during pointing tasks
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DOI：
10.1007/s00221-009-2073-1
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发表时间：
2010-03-01
影响因子：
2
通讯作者：
Keller, Flavio
中科院分区：
文献类型：
--
作者：
Campolo, Domenico;Formica, Domenico;Keller, Flavio
在这项工作中，我们测试了大脑采用内在运动学约束（如Donders定律）来解决手腕指向目标时的冗余的假设。10名健康受试者被要求用手腕的三自由度指向显示器上显示的视觉目标。从运动任务执行过程中获得的腕部方向导出三维旋转向量，并将其数值拟合到二次曲面上以测试Donders定律。从+/- 15A度到+/- 30A度的角偏移，Donders表面的厚度，即与最佳拟合表面的偏差，在1A度到2A度之间。结果支持被测试的假设，特别是：(a)二维厚表面可能代表手腕运动学的约束，(b)运动策略的主体间差异可以通过Donders表面的曲率来理解。
In this work, we tested the hypothesis that intrinsic kinematic constraints such as Donders' law are adopted by the brain to solve the redundancy in pointing at targets with the wrist. Ten healthy subjects were asked to point at visual targets displayed on a monitor with the three dof of the wrist. Three-dimensional rotation vectors were derived from the orientation of the wrist acquired during the execution of the motor task and numerically fitted to a quadratic surface to test Donders' law. The thickness of the Donders' surfaces, i.e., the deviation from the best fitting surface, ranged between 1A degrees and 2A degrees, for angular excursions from +/- 15A degrees to +/- 30A degrees. The results support the hypothesis under test, in particular: (a) Two-dimensional thick surfaces may represent a constraint for wrist kinematics, and (b) inter-subject differences in motor strategies can be appreciated in terms of curvature of the Donders' surfaces.