Kinematic Analysis of Early Online Control of Goal-Directed Reaches: A Novel Movement Perturbation Study
Kinematic Analysis of Early Online Control of Goal-Directed Reaches: A Novel Movement Perturbation Study
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DOI：
10.1123/mcj.13.3.280
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发表时间：
2009-07-01
期刊：
影响因子：
1.1
通讯作者：
Elliott, Digby
中科院分区：
文献类型：
--
作者：
Grierson, Lawrence E. M.;Gonzalez, Claudia;Elliott, Digby
本研究的目的是探讨视觉的重要性，以纠正过程中与机械扰动的肢体目标导向瞄准。在视觉和非视觉条件下，表演者用手持笔到达由垂直线的交叉点表示的目标。将触针连接到空气压缩机，并设计成使得在运动开始后的80 ms到达被在运动的方向上或与运动相反的短空气爆发扰动。在早期的运动学标志的肢体的空间位置分析表明，单向爆发是成功的推进和阻碍运动的进展。此外，在受试者试验到试验的变异性分析表明，表演者采用不同的控制策略来处理的扰动取决于视觉的可用性。目前的研究结果表明，一个连续的在线控制的形式是行使在瞄准轨迹的早期部分。这种形式的控制可以通过视觉或本体感受信息来介导。
This study was designed to examine the importance of vision to corrective processes associated with a mechanical perturbation to the limb during goal-directed aiming. With a hand held stylus, under vision and no vision conditions, performers reached to a target represented by the intersection of perpendicular lines. The stylus was connected to an air compressor and engineered such that 80 ms following movement initiation reaches were perturbed by a short air burst either in the direction of, or opposite to, the movement. Spatial position analysis of the limb at early kinematic landmarks revealed that the single direction bursts were successful in advancing and hindering the movement progress. Furthermore, within subject trial-to-trial variability analysis indicated that performers adopted different control strategies for dealing with the perturbations depending on the availability of vision. The present findings suggest that a continuous form of online control is exercised during the early portions of the aiming trajectories. This form of control may be mediated by visual or proprioceptive information.