Fig. 1.

Trial sequence of experiment 1. Participants had to respond by fixating the unique shape (target singleton) for 100 ms. One of the nontarget shapes (distractor) signaled the magnitude of the reward that could be earned, if participants made a fast saccade to the target. Depending on the color of this distractor (red or blue), participants received either high or low reward. Dashed lines (not visible to the participants) indicate the region of interest (ROI) around the target and the reward-signaling distractor. If participants fixated in the distractor ROI at any point in time, the trial was marked as an omission trial and no reward was delivered.