Simpson W A, Swanston M T
Department of Psychology, University of Winnipeg, Manitoba, Canada.
Exp Brain Res. 1991;86(2):447-50. doi: 10.1007/BF00228971.
When two sine-wave gratings drift in different directions at the same speed behind a circular window, a single coherent plaid is seen rather than one grating sliding over the other. We find that as the stereo depth separation of the two component gratings increases, the probability of seeing a plaid declines. The gain of the slow phase of vertical optokinetic nystagmus (OKN) also falls as the separation of the components increases. When the two grating components are in the same depth plane, the vertical eye velocity is greater than that of either component. This shows that the OKN is being driven by the plaid, whose vertical speed is roughly twice as fast as the components. We conclude that both perception and OKN are fed by the same motion signal, which arises after binocular combination and after plaid synthesis.
当两个正弦波光栅以相同速度在圆形窗口后沿不同方向漂移时，看到的是一个单一的相干方格图案，而不是一个光栅在另一个上面滑动。我们发现，随着两个组成光栅的立体深度分离增加，看到方格图案的概率会下降。随着组成部分的分离增加，垂直视动性眼球震颤（OKN）慢相的增益也会下降。当两个光栅组成部分处于同一深度平面时，垂直眼速大于任何一个组成部分的眼速。这表明OKN是由方格图案驱动的，其垂直速度大约是组成部分的两倍。我们得出结论，感知和OKN都由相同的运动信号提供，该信号在双眼组合和方格图案合成之后产生。
