Figure 1. Saccade and fixation stimuli.

A, Two stimuli that were interchangeably used as target and distracter stimuli. B, Time course of horizontal eye position in fixation and saccade trials and visual stimuli corresponding to each temporal interval. The mean saccadic delay (MSD) was estimated prior to image presentation for each subject. The blank frames in the fixation trials were set to appear for a duration equal to the MSD prior to target/distracter presentation of 150 ms. The duration of image presentation in saccade trials was set to 150 ms plus the MSD in order to ensure that the image presentation duration after saccadic landing was also approximately 150 ms.