Grierson Lawrence E M, Gonzalez Claudia, Elliott Digby
Dept. of Kinesiology, McMaster University, Hamilton, Ontario, Canada.
Motor Control. 2009 Jul;13(3):280-96. doi: 10.1123/mcj.13.3.280.
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.
本研究旨在探讨视觉对于在目标导向性瞄准过程中与肢体机械扰动相关的纠正过程的重要性。在有视觉和无视觉条件下，参与者手持触控笔伸向由垂直线交点所代表的目标。触控笔连接到空气压缩机，其设计使得在运动开始80毫秒后，伸向目标的动作会受到一个短时间的气流冲击干扰，气流冲击方向与运动方向相同或相反。对早期运动学标志点处肢体的空间位置分析表明，单一方向的气流冲击成功地推进或阻碍了运动进程。此外，受试者内的逐次试验变异性分析表明，根据视觉的可得性，参与者采用了不同的控制策略来应对扰动。目前的研究结果表明，在瞄准轨迹的早期阶段会进行一种连续形式的在线控制。这种控制形式可能由视觉或本体感觉信息介导。
