Pantle A, Lehmkuhle S, Caudill M
Perception. 1978;7(3):261-7. doi: 10.1068/p070261.
Direction-specific losses of contrast sensitivity for sinusoidal test gratings as a function of the contrast of a sinusoidal adapting grating were found to be similar to those measured previously with square-wave gratings. Furthermore, both relationships were similar to that between motion aftereffect duration and the contrast of sinusoidal adapting gratings, and all three sets of data can be fit by a single function. The function shows that the magnitude of direction-specific adaptation effects increases linearly with the logarithm of adapting contrast in the low contrast region, but is essentially independent of contrast once the contrast exceeds threshold by more than a factor of five-six. In addition, it was found that direction-specific losses of contrast sensitivity are restricted to limited ranges of spatial frequency.
研究发现，正弦测试光栅的对比度敏感度在特定方向上随正弦适应光栅对比度的变化情况，与之前用方波光栅测量的结果相似。此外，这两种关系都与运动后效持续时间和正弦适应光栅对比度之间的关系相似，并且所有三组数据都可以用一个单一函数来拟合。该函数表明，在低对比度区域，特定方向适应效应的大小随适应对比度的对数呈线性增加，但一旦对比度超过阈值五到六倍以上，效应基本与对比度无关。此外，还发现对比度敏感度在特定方向上的损失仅限于有限的空间频率范围。
