Ejima Y, Takahashi S
Department of Psychology, College of Liberal Arts, Kyoto University, Japan.
Vision Res. 1988;28(1):157-70.
The threshold-duration functions were determined for a 520-, 570-, or 650-nm test presented upon the various monochromatic backgrounds. The variation of the threshold-duration functions with the background intensity, taken with the 520- or 650-nm test, showed a strong dependence on the background wavelength. This wavelength difference became prominent for the high background intensities: for the bright 570-nm background, partial summation occurred for the duration range from 50 to 200 msec, while such a partial summation effect was very small for the bright 520- and 650-nm background. Test for test-mixture additivity indicated that the longer integration time, obtained for the 520- or 650-nm test with the 570-nm background, was attributed to contribution of the opponent-color process. The elongation of the temporal integration period was found to be affected by the size of the test target. The interrelation among temporal and spatial summation, background intensity, and wavelength could be accounted for by temporal integration of the opponent-color process in addition to that of the cone mechanisms.
针对在各种单色背景上呈现的520纳米、570纳米或650纳米测试光，测定了阈限持续时间函数。采用520纳米或650纳米测试光时，阈限持续时间函数随背景强度的变化显示出对背景波长的强烈依赖性。这种波长差异在高背景强度时变得显著：对于明亮的570纳米背景，在50至200毫秒的持续时间范围内出现了部分总和现象，而对于明亮的520纳米和650纳米背景，这种部分总和效应非常小。测试混合物相加性表明，在570纳米背景下用520纳米或650纳米测试光获得的较长积分时间归因于拮抗色过程的贡献。发现时间积分周期的延长受测试目标大小的影响。除了视锥细胞机制的时间积分外，拮抗色过程的时间积分也可以解释时间和空间总和、背景强度与波长之间的相互关系。
