Pantle A J
Vision Res. 1983;23(8):749-57. doi: 10.1016/0042-6989(83)90196-7.
A temporal forced-choice procedure was used to measure the contrast threshold for a sinusoidal test grating (spatial frequency - f) superimposed upon a sinusoidal background or masking grating (spatial frequency = 3f). The spatial contrast of the background grating was varied, and threshold measurements were made at each of a number of background contrasts to describe a threshold versus masking contrast (tvc) function. Tvc functions were obtained when the background and test grating contrasts were, independently of each other, held steady (0 Hz) or modulated at 5 Hz. The changes of temporal modulation frequency affected the slopes of the tvc functions. In some cases the tve functions for steady and flickering test gratings crossed one another. The changes of slope suggest, and the crossovers imply, that some steady and flickering patterns are detected by separate visual mechanisms.
采用时间强制选择程序来测量叠加在正弦背景或掩蔽光栅（空间频率 = 3f）上的正弦测试光栅（空间频率 - f）的对比度阈值。背景光栅的空间对比度是变化的，并且在多个背景对比度下分别进行阈值测量，以描述阈值与掩蔽对比度（tvc）函数。当背景和测试光栅的对比度彼此独立地保持稳定（0 Hz）或在5 Hz下调制时，获得了tvc函数。时间调制频率的变化影响了tvc函数的斜率。在某些情况下，稳定和闪烁测试光栅的tve函数相互交叉。斜率的变化表明，交叉现象意味着，一些稳定和闪烁模式是由不同的视觉机制检测到的。
