Schnitzler A D
J Opt Soc Am. 1976 Jun;66(6):617-25. doi: 10.1364/josa.66.000617.
A detailed theory of the detection of sinusoidal gratings displayed with suprathreshold luminous fluctuations is developed by employing a previous model of the visual and decision-making systems. An important feature of the model is the organization of the photoreceptors and decision-making system into a set of parallel, independent photoreceptive field (PRF)-decision center channels that function like a set of parallel spatial-frequency filters, each associated with an independent threshold detector. A technique is proposed for determining the modulation sensitivity functions (MSFs) of single detection channels by obtaining threshold modulation (MTN) data at a fixed sinusoidal grating frequency (v) while varying the center frequency (vc) of narrow-band luminous fluctuations caused by video noise (VN). The theory predicts that the ratio, at a given v, of MTN obtained as a function of vc to the MTN obtained without VN is proportional to the MSF of the particular channel for which the widths of the excitatory and inhibitory regions of the PRF equal a half-period of v. Good agreement between theoretical curves and experimental data appearing in the literature provides strong corroboration of the theory.
通过采用先前的视觉和决策系统模型，建立了一个关于检测呈现超阈值光波动的正弦光栅的详细理论。该模型的一个重要特征是将光感受器和决策系统组织成一组并行、独立的光感受野（PRF）-决策中心通道，其功能类似于一组并行的空间频率滤波器，每个滤波器都与一个独立的阈值检测器相关联。提出了一种通过在固定的正弦光栅频率（v）下获取阈值调制（MTN）数据，同时改变由视频噪声（VN）引起的窄带光波动的中心频率（vc），来确定单个检测通道的调制灵敏度函数（MSF）的技术。该理论预测，在给定的v下，作为vc的函数获得的MTN与没有VN时获得的MTN之比，与PRF的兴奋区和抑制区宽度等于v的半个周期的特定通道的MSF成正比。理论曲线与文献中出现的实验数据之间的良好一致性为该理论提供了有力的佐证。
