Fig. 1.

The upper panel–Example of consecutive displays presented in the search task. Participants were asked to search for the target shape singleton (either a diamond among circles or a circle among diamonds) in the presence of an irrelevant distractor color singleton (either a green shape among red shapes or a red shape among green shapes). The distractor singleton was presented more often in the high-probability location than in the low-probability location. The lower panel—Example of consecutive displays presented in the probe task. Participants were asked to indicate the presence of a dot offset (go trials) or refrain from responding (no-go trials). (Color figure online)