Yao Wan X, DeSola Bill, Zunker Weston, Zhong C Bi, Wallace Stephen A, Ding Yuchuan
Department of Health and Kinesiology, College of Education and Human Development, The University of Texas at San Antonio, San Antonio, TX 78249, USA.
Percept Mot Skills. 2007 Apr;104(2):611-20. doi: 10.2466/pms.104.2.611-620.
Subtended angle has been assumed to be an important factor in both response programming time and kinematic characteristics of aiming movements. Support for this assumption has come mainly from studies in which circular targets have been used. However, with circular targets, the subtended angle covaries with the size of the target in the principal direction of the movement (tolerance width). The purpose of this study was to examine the effects of tolerance width and subtended angle on aiming movement with multiple targets. Participants first hit a 5-cm-diameter circular target located 8 cm to the left of a starting position and then moved another 8 cm left to hit either a 5-cm diameter circular target or a 5- x 1-cm rectangular target oriented either horizontally or vertically, depending on the condition. Analysis showed that reaction times and movement times were longer for the vertical rectangular target, which had a smaller tolerance width than the other two targets. In addition, the vertical rectangular target also showed a greater percentage of secondary-submovement trials, lower movement velocity, and higher peak vertical displacement. Overall, the results indicate that the tolerance width of the target may impose more constraints on aiming movements than subtended angle.
张角被认为是反应编程时间和瞄准动作运动学特征的一个重要因素。对这一假设的支持主要来自使用圆形目标的研究。然而，对于圆形目标，张角与运动主方向上目标的大小（容差宽度）共变。本研究的目的是检验容差宽度和张角对多目标瞄准动作的影响。参与者首先击打位于起始位置左侧8厘米处的一个直径5厘米的圆形目标，然后再向左移动8厘米，根据条件击打一个直径5厘米的圆形目标或一个5×1厘米的水平或垂直方向的矩形目标。分析表明，垂直矩形目标的反应时间和运动时间更长，其容差宽度比其他两个目标小。此外，垂直矩形目标还表现出更高比例的二次子运动试验、更低的运动速度和更高的垂直峰值位移。总体而言，结果表明目标的容差宽度可能比张角对瞄准动作施加更多限制。
