Motion-contrast sensitivity: visibility of motion gradients of various spatial frequencies
Motion-contrast sensitivity: visibility of motion gradients of various spatial frequencies
复制标题
运动对比灵敏度：各种空间频率的运动梯度的可见性
DOI：
10.1364/josaa.11.000496
复制
发表时间：
1994
影响因子：
1.9
通讯作者：
M. P. Eckert
中科院分区：
文献类型：
--
作者：
A. Watson;M. P. Eckert
我们的实验的目的是估计运动梯度的基本灵敏度，并评估运动信号的二阶积分和微分的证据。我们测量了两个相对移动的带通滤波噪声图像之间的空间正弦对比度调制的灵敏度。运动对比度灵敏度函数，定义为调制空间频率的函数的阈值调制幅度的倒数，是带通的形状，在最高和最低频率下降。当调制频率表示为噪声频率的分数时，三个噪声空间频率的函数具有近似相同的形状。我们将数据与线性运动滤波器的模型进行了比较，线性运动滤波器的输出被平方或整流，然后是第二阶段的兴奋性或抑制性池化。数据与模型一致，其中（1）所有兴奋性汇集发生在线性阶段，（2）第二阶段包含一个大的抑制汇集区域，半径约为线性感受野半径的8倍。
The purpose of our experiments was to estimate basic sensitivity to motion gradients and to evaluate the evidence for second-order integration and differentiation of motion signals. We measured sensitivity to spatially sinusoidal contrast modulation between two oppositely moving bandpass-filtered noise images. The motion-contrast sensitivity function, defined as the inverse of threshold modulation amplitude as a function of modulation spatial frequency, was bandpass in shape with declines at both highest and lowest frequencies. The functions for three noise spatial frequencies had approximately the same shape when modulation frequency was expressed as a fraction of noise frequency. We compared the data with a model in which linear motion filters, whose outputs are squared or rectified, are followed by a second stage of excitatory or inhibitory pooling. The data are consistent with a model in which (1) all excitatory pooling occurs at the linear stage and (2) the second stage contains a large inhibitory pooling area, with a radius approximately eight times that of the linear receptive field.
影响因子：
2.5
作者：
MAUNSELL, JHR;VANESSEN, DC
通讯作者：
VANESSEN, DC