Kreegipuu Kairi, Allik Jüri
University of Tartu and the ECBHS, Tiigi 78, Tartu, 50410, Estonia.
Psychol Res. 2007 Nov;71(6):703-8. doi: 10.1007/s00426-006-0059-1. Epub 2006 Apr 25.
Manual reaction time (RT) and visual evoked potentials (VEP) were measured in motion onset and offset detection tasks. A considerable homology was observed between the temporal structure of RTs and VEP intervals, provided that the change in motion was detected as soon as the VEP signal has reached critical threshold amplitude. Both manual reactions and VEP rise in latency as the velocity of the onset or offset motion decreases and were well approximated by the same negative power function with the exponent close to -2/3. This indicates that motion processing is normalised by subtracting the initial motion vector from ongoing motion. A comparison of the motion onset VEP signals in two different conditions, in one of which the observer was instructed to abstain from the reaction and in the other to indicate as fast as possible the beginning of the motion, contained accurate information about the manual response.
在运动开始和结束检测任务中测量了手动反应时间（RT）和视觉诱发电位（VEP）。只要VEP信号达到临界阈值幅度就检测到运动变化，那么在RT的时间结构和VEP间隔之间观察到了相当大的同源性。随着开始或结束运动速度的降低，手动反应和VEP的潜伏期都会增加，并且都可以很好地用指数接近-2/3的相同负幂函数来近似。这表明通过从正在进行的运动中减去初始运动向量来对运动处理进行归一化。在两种不同条件下对运动开始VEP信号进行比较，其中一种条件下观察者被指示不做出反应，另一种条件下观察者被指示尽快指出运动的开始，这包含了有关手动反应的准确信息。
