Lovegrove W J, Meyer G E
Vision Res. 1984;24(3):255-9. doi: 10.1016/0042-6989(84)90128-7.
Using a variety of measures it has been shown that processing time increases with increasing spatial frequency. Long and Sakitt (1981) [Vision Res. 21, 1387-1393] investigated duration of visible persistence as a function of both spatial frequency and number of cycles present. They concluded that number of cycles and not spatial frequency is the crucial variable in determining duration of visible persistence. The present paper investigates this issue in three experiments. Experiments 1 and 2 determined duration of visible persistence with spatial frequencies of 2, 4, 8 and 10 c/deg while holding both number of cycles and grating area constant in a dark surround and in a light surround. Stimulus durations of 50 and 300 msec were used in Experiments 1 and 2 respectively. The results at each stimulus duration showed an increase in duration of visible persistence with increasing spatial frequency similar to that found in most previous reports. This increase was less with a 300 than with a 50 msec stimulus duration. Whether the gratings were presented in a light or a dark surround had no significant effect. Experiment 3 showed that at 2 c/deg duration of visible persistence increased with increasing size of the grating stimuli when all stimulus sizes fell within the area of spatial summation. This effect was greater in a dark than in light surround. It is concluded that visible persistence does increase with spatial frequency. Previous results inconsistent with this conclusion are explained in terms of spatial summation.
通过各种测量方法已经表明，处理时间会随着空间频率的增加而增加。朗和萨基特（1981年）[《视觉研究》21卷，1387 - 1393页]研究了可见持续时间作为空间频率和呈现的周期数的函数。他们得出结论，在确定可见持续时间时，周期数而非空间频率是关键变量。本文通过三个实验对这个问题进行了研究。实验1和实验2在暗背景和亮背景下，保持周期数和光栅面积不变，测定了空间频率为2、4、8和10周/度时的可见持续时间。实验1和实验2分别使用了50毫秒和300毫秒的刺激持续时间。每个刺激持续时间的结果都表明，可见持续时间会随着空间频率的增加而增加，这与之前大多数报告中的结果相似。与50毫秒的刺激持续时间相比，300毫秒时这种增加幅度较小。光栅是呈现在亮背景还是暗背景下并没有显著影响。实验3表明，当所有刺激大小都在空间总和区域内时，在2周/度时，可见持续时间会随着光栅刺激大小的增加而增加。这种效应在暗背景下比在亮背景下更明显。得出的结论是，可见持续时间确实会随着空间频率的增加而增加。根据空间总和对与该结论不一致的先前结果进行了解释。
