Georgeson M A, Turner R S
Vision Res. 1984;24(8):851-8. doi: 10.1016/0042-6989(84)90157-3.
Observers viewed 200 msec presentations of gratings containing first (0.5 c/deg) and third (1.5 c/deg) harmonic components. The phase of the third harmonic and the absolute position of the grating on the screen varied randomly from trial to trial. Classification of the phase relation (0, 90, 180 or 270 deg was 99% perfect. When a 2 sec period of inspection of the grating or its fundamental preceded the test presentation, strong shifts in perceived waveform were observed that depended on the test grating's position relative to the inspection grating, and resembled the effects seen during continuous viewing. No phase-specific effects were obtained. The pattern of results was exactly that predicted by negative afterimage. Phase recognition at low contrast, and at a high frequency, was also good. Triangular-wave gratings were misperceived (the "square-wave illusion") only when real or simulated afterimages were present. We conclude that recognition of phase relations in a complex waveform is stable when the predictable variation due to afterimages is eliminated.
观察者观看了包含基波（0.5周/度）和三次谐波（1.5周/度）分量的光栅的200毫秒呈现。三次谐波的相位以及光栅在屏幕上的绝对位置在每次试验中随机变化。相位关系（0、90、180或270度）的分类准确率为99%。当在测试呈现之前有2秒的时间检查光栅或其基波时，观察到感知波形有强烈的偏移，这取决于测试光栅相对于检查光栅的位置，并且类似于连续观看期间看到的效果。未获得特定相位的效应。结果模式与负后像预测的完全一致。低对比度和高频下的相位识别也很好。只有当存在真实或模拟后像时，三角波光栅才会被错误感知（“方波错觉”）。我们得出结论，当消除由于后像引起的可预测变化时，复杂波形中相位关系的识别是稳定的。
