Light and dark bars; contrast discrimination.
Light and dark bars; contrast discrimination.
复制标题
亮条和暗条；
DOI：
10.1016/0042-6989(83)90122-0
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发表时间：
1983
期刊：
影响因子：
1.8
通讯作者：
Kersten,D
中科院分区：
文献类型：
--
作者：
Legge,GE;Kersten,D
对比增量阈值是测量亮条和暗条的基本对比度的函数。棒材叠加在340 cd/m2的均匀场上。它们有矩形或高斯亮度分布，宽度从0.1°到10°不等，持续时间从10到200毫秒不等。对于200毫秒的演示，当对比度定义为(Lmax−Lmin)/(Lmax+ Lmin)时，得到的对比度判别函数都具有大致相同的形状，并且与正弦波光栅的相应结果非常相似。明暗条对比判别函数的形状相似性是由于视网膜的非线性强度变换。10毫秒对比辨别功能与200毫秒对比辨别功能的不同之处可以用时间整合的差异来解释。
Contrast increment thresholdswere measured for light and dark bars as a function of the base contrast of the bars. The bars were superimposed on a uniform field of 340 cd/m2. They had either rectangular or Gaussian luminance profiles, varied in width from 0.1° to 10°, and in duration from 10 to 200 msec. For the 200-msec presentations, the resultingcontrast discrimination functionsall had approximately the same shape when contrast was defined as(Lmax−Lmin)/(Lmax+ Lmin), and closely resembled corresponding results for sine-wave gratings. The similarity in shape of contrast discrimination functions for light and dark bars is attributed to a retinal nonlinear intensity transformation. The 10 msec contrast discrimination functions differed from the 200-msec functions in ways that can be explained by differences in temporal integration.