Saleh B E, Tulunay-Keesey U, Ver Hoeve J N, Hom M
Department of Electrical and Computer Engineering, University of Wisconsin, Madison 53706.
J Opt Soc Am A. 1991 Jul;8(7):1172-81. doi: 10.1364/josaa.8.001172.
The addition of a uniform increment of light to a high-contrast image that has been stabilized on the retina reveals marked perceptual nonlinearities. When the increment is small, the pattern appears in its original phase (OP), large increments produce an apparent phase reversal (APR), and intermediate increments may yield an apparently blank field or an oscillation of the apparent phase. In the present series of studies the threshold values used to produce a stable OP and APR were determined as a function of adaptation time before the application of the increment. The stabilized target had a luminance profile consisting of the difference of two Gaussians. A model of detection incorporating a multiplicative gain controlled by a filtered version of the stimulus was used to account for the occurrence of the OP and the APR and the transitory phenomena following the uniform increment. It is argued that the midpoint of the transition zone between the OP and APR, corresponding to blanking, enables us to estimate the shape of the step response function of the gain filter independently of the subsequent detection processes.
向已稳定在视网膜上的高对比度图像添加均匀的光增量会显示出明显的感知非线性。当增量较小时，图案以其原始相位（OP）出现，大的增量会产生明显的相位反转（APR），中间增量可能会产生明显的空白场或表观相位的振荡。在本系列研究中，用于产生稳定OP和APR的阈值是根据施加增量之前的适应时间确定的。稳定的目标具有由两个高斯函数之差组成的亮度分布。使用一个检测模型，该模型包含一个由刺激的滤波版本控制的乘法增益，以解释OP和APR的出现以及均匀增量后的瞬态现象。有人认为，OP和APR之间过渡区的中点，对应于消隐，使我们能够独立于后续检测过程来估计增益滤波器的阶跃响应函数的形状。
