Giaschi D, Anstis S
Department of Psychology, York University, Ontario, Canada.
Vision Res. 1989;29(3):335-47. doi: 10.1016/0042-6989(89)90082-5.
The apparent motion (AM) created by two spots illuminated in alteration looks faster when there is dark temporal interval (ISI) between the offset of one spot and the onset of the other than when the spots are presented immediately after one another (no ISI), even though the temporal frequency and the spatial separation between spots are held constant. AMISI looks 18.6% faster than AMnoISI at temporal frequencies between 1.5 and 4.5 Hz. Reducing the duty cycle from 0.5 to 0.05 increases the apparent speedup to 30%. This difference in subjective speed is not due to differential saturation of velocity detectors, nor to the apparent spatial separation between spots, nor to differences in the time-averaged luminance of the stimuli. It is the "on-time", the time for which the spot is visible in one position, that determines the subjective speed. The longer the on-time, the slower the spot appears to move.
由交替照亮的两个光斑产生的表观运动（AM），当一个光斑的熄灭与另一个光斑的亮起之间存在黑暗的时间间隔（ISI）时，比光斑紧接着呈现（无ISI）时看起来更快，尽管光斑之间的时间频率和空间间隔保持不变。在1.5至4.5赫兹的时间频率下，AMISI看起来比AMnoISI快18.6%。将占空比从0.5降低到0.05会使表观加速增加到30%。这种主观速度的差异并非由于速度探测器的差异饱和，也不是由于光斑之间的表观空间间隔，也不是由于刺激的时间平均亮度的差异。是“开启时间”，即光斑在一个位置可见的时间，决定了主观速度。开启时间越长，光斑看起来移动得越慢。
