Grierson Lawrence E M, Lyons James, Elliott Digby
Department of Family Medicine, Faculty of Health Sciences, McMaster University, Hamilton, Ontario, Canada.
J Mot Behav. 2011;43(5):383-91. doi: 10.1080/00222895.2011.606441. Epub 2011 Aug 23.
Examinations of goal-directed movements reveal a process of control that operates to make adjustments on the basis of the expected visual afference associated with the limb's movement. This experiment examined the impact of perturbations to the perceived and actual velocity of aiming movements when each was presented alone or in tandem with the other. Perturbations to perceived velocity were achieved by translating the background over which aiming movements were performed. An aiming stylus that discharged air either in the direction of the movement or in the direction opposite the movement generated the actual velocity perturbations. Kinematic analyses of the aiming movements revealed that only the actual perturbation influenced the control of early movement trajectories. The results are discussed with respect to the influence that visual information has on the control exerted against physical perturbations. Speculations are raised regarding how potential for perturbations influences the strategies adopted for minimizing their impact.
对目标导向运动的研究揭示了一种控制过程，该过程基于与肢体运动相关的预期视觉传入信息进行调整。本实验研究了单独呈现或同时呈现对瞄准运动的感知速度和实际速度的扰动的影响。通过平移进行瞄准运动的背景来实现对感知速度的扰动。一个在运动方向或与运动方向相反方向排放空气的瞄准笔产生实际速度扰动。对瞄准运动的运动学分析表明，只有实际扰动会影响早期运动轨迹的控制。讨论了视觉信息对抵抗物理扰动所施加控制的影响。还提出了关于扰动可能性如何影响为最小化其影响而采用的策略的推测。
