Dienes Z, McLeod P
Department of Experimental Psychology, University of Sussex, Brighton, UK.
Perception. 1993;22(12):1427-39. doi: 10.1068/p221427.
A cricket or baseball fielder can run so as to arrive at just the right place at just the right time to catch a ball. It is shown that if the fielder runs so that d2(tan alpha)/dt2 = 0, where alpha is the angle of elevation of gaze from fielder to ball, then the ball will generally be intercepted before it hits the ground. This is true whatever the aerodynamic drag experienced by the ball. The only exception is if the ball is not approaching the fielder before he starts to run.
板球或棒球外野手可以奔跑，以便在恰当的时间到达恰当的位置接住球。研究表明，如果外野手奔跑时使得(d^{2}(\tan\alpha)/dt^{2}=0)，其中(\alpha)是从外野手到球的仰角，那么球通常会在落地前被截住。无论球所经历的空气阻力如何，都是如此。唯一的例外是，如果在外野手开始奔跑之前球没有朝着他飞来。
