Masking by spatially-modulated gratings
Masking by spatially-modulated gratings
复制标题
空间调制光栅掩蔽
DOI：
10.1016/0042-6989(83)90176-1
复制
发表时间：
1983
期刊：
影响因子：
1.8
通讯作者：
B. Rogowitz
中科院分区：
文献类型：
--
作者：
J. Nachmias;B. Rogowitz
由三个高频分量（8.8、11 和 13.2 c/deg）组成的对比或准调频掩蔽光栅会影响 2.2 c/deg 信号光栅的可检测性，其程度在很大程度上取决于信号和掩蔽之间的相对相位。未调制的高频掩蔽器不具有这种相位相关效应。本文探讨了视觉系统对亮度的非线性响应导致这些现象的可能性。提出了一种具体假设，根据该假设，空间调制掩蔽器的效果完全是由于视觉非线性引起的 2.2 c/deg 失真产物造成的。尽管该假设的一些预测得到了实验结果的证实，但其他预测却相互矛盾。
Contrast- or quasi-frequency-modulated masker gratings consisting of three high frequency components (8.8, 11 and 13.2 c/deg) affect the detectability of a 2.2 c/deg signal grating, to an extent that is strongly dependent upon the relative phase between signal and masker. Unmodulated high frequency maskers have no such phase-dependent effects. This paper explores the possibility that the visual system's nonlinear response to luminance is responsible for these phenomena. A specific hypothesis is proposed according to which the effects of the spatially modulated maskers are due entirely to a distortion product at 2.2 c/deg caused by the visual nonlinearity. Although some of the predictions of this hypothesis are borne out by the experimental findings, others are contradicted.