De Valois K K, Switkes E
Proc Natl Acad Sci U S A. 1980 Jan;77(1):662-5. doi: 10.1073/pnas.77.1.662.
Adaptation to patterns of paired random dots produces loss of contrast sensitivity to sinusoidal luminance gratings oriented perpendicularly to the dot-pair direction. This adaptation loss is spatial frequency- and orientation-specific and varies with dot-pair separation in a manner predictable from the Fourier spectra of the stimuli and observed characteristics of the visual system. These results support the idea that the visual system acts as a periodicity analyzer with known restrictions and cannot be accounted for by a feature-detector model. When the bars of the test gratings are aligned in the dot-pair direction, there is no adaptational loss at any frequency despite the fact that the adaptation pattern contains significant spectral power at all frequencies in this orientation. This lack of adaptation may be due to inhibitory interactions among channels or to nonlinear effects within local receptive fields.
对成对随机点模式的适应会导致对与点对方向垂直的正弦亮度光栅的对比度敏感度丧失。这种适应损失具有空间频率和方向特异性，并且以一种可从刺激的傅里叶光谱和视觉系统的观察特征预测的方式随点对间距而变化。这些结果支持了这样一种观点，即视觉系统作为一个具有已知限制的周期性分析仪，不能用特征检测器模型来解释。当测试光栅的条纹与点对方向对齐时，尽管适应模式在该方向的所有频率上都包含显著的光谱功率，但在任何频率下都没有适应损失。这种缺乏适应可能是由于通道之间的抑制性相互作用或局部感受野内的非线性效应。
