Example stimuli employed in Experiment 1.

Participants were required to detect target letters within digit distractors. SOA was either 30 msec or 90 msec. The location of T1 was jittered between serial positions 4, 5 and 6. T2 appeared at lag 1, 2 or 6. Every trial contained at least two targets. If a third target appeared, it was positioned directly after T2. Targets are underlined in this table for ease of detection. Targets were not underlined in the actual task.

被试需在数字分心物中检测目标字母。刺激呈现异步性（Stimulus Onset Asynchrony，SOA）的取值为30毫秒或90毫秒。第一个目标（T1）的呈现位置在序列位置4、5和6之间随机变动。第二个目标（T2）的滞后位置为1、2或6。每个试次至少包含两个目标。若出现第三个目标，则其位置紧邻T2之后。为便于检测，本表格中的目标已添加下划线；但在实际实验任务中，目标并未添加下划线。