Vaughan J
J Exp Psychol Hum Percept Perform. 1982 Oct;8(5):709-23. doi: 10.1037//0096-1523.8.5.709.
In visual search a variable delay (up to 150 msec) between the beginning of each fixation and the onset of a search stimulus reduces the time (oculomotor latency) between stimulus onset and the subject's next saccadic eye movement. Two hypotheses for this effect of stimulus onset delay (SOD) were compared: first, process monitoring, that SOD simply serves as a warning interval to facilitate saccadic responses; and second, preprogramming, that saccades are preprogrammed at short SODs. In the first experiment SOD produced a decline in oculomotor latency in search similar to that seen in previous studies. In the second and third experiments, the size of the memory set in a Sternberg memory search paradigm was varied, or a mask flanking some of the search stimuli was used, to vary the processing time of each stimulus. Partial preprogramming of saccades at short delays would predict that increasing the processing time of individual stimuli would increase oculomotor latency at only short SODs. However, oculomotor latency increased equally at all SODs. In this search task, then, the SODs appeared to facilitate saccade initiation.
在视觉搜索中，每次注视开始与搜索刺激出现之间存在可变延迟（最长可达150毫秒），这会减少刺激出现与受试者下一次眼跳运动之间的时间（眼动潜伏期）。对刺激开始延迟（SOD）产生这种效应的两种假设进行了比较：第一，过程监测，即SOD仅作为一个预警间隔，以促进眼跳反应；第二，预编程，即眼跳在短SOD时是预先编程的。在第一个实验中，SOD导致搜索中的眼动潜伏期下降，类似于先前研究中观察到的情况。在第二个和第三个实验中，改变了斯特恩伯格记忆搜索范式中记忆集的大小，或者使用了一些搜索刺激两侧的掩蔽，以改变每个刺激的处理时间。短延迟时眼跳的部分预编程预测，增加单个刺激的处理时间只会在短SOD时增加眼动潜伏期。然而，在所有SOD下，眼动潜伏期的增加是相同的。因此，在这个搜索任务中，SOD似乎促进了眼跳的启动。
