Hansen Steve
Department of Physical Education and Kinesiology, Brock University, St. Catherines, Ontario, Canada.
J Mot Behav. 2010 Mar-Apr;42(2):107-10. doi: 10.1080/00222890903566343.
The author examined the minimum amount of time needed for vision to increase aiming accuracy and decrease movement duration. Participants selected when they would receive a visual sample during aiming movements by pressing a switch held with the left hand. The sample was one of the following durations: 40 ms, 30 ms, 20 ms, 10 ms, or 0 ms (no vision). Decreased accuracy in the no-vision condition compared to the vision conditions was observed when the duration of the impending sample was unknown (Experiment 1). Samples 40 ms in duration were sufficient to decrease endpoint variability when the duration of the sample was known before the movement (Experiment 2). These results indicate that short visual samples can be used to decrease movement time and increase accuracy and that knowledge of the impending visual context can impact the individual's subsequent behavior.
作者研究了视觉提高瞄准准确性和减少动作持续时间所需的最短时间。参与者在进行瞄准动作时，通过按下左手持有的开关来选择何时接收视觉样本。样本的持续时间为以下之一：40毫秒、30毫秒、20毫秒、10毫秒或0毫秒（无视觉）。当即将到来的样本持续时间未知时（实验1），观察到与有视觉条件相比，无视觉条件下准确性降低。当在动作前已知样本持续时间时，持续40毫秒的样本足以减少终点变异性（实验2）。这些结果表明，短视觉样本可用于减少动作时间并提高准确性，并且对即将到来的视觉情境的了解会影响个体随后的行为。
