During each trial of the antisaccade task (adapted from Roberts, Hager, & Heron, 1994), participants were required to override their automatic tendency to move their eyes toward a cue when it briefly flashed (for 150 ms) on the left or right side of the computer screen. Instead, they had to quickly move their eyes in the opposite direction to see a small target (a box containing a 5/16-in. arrow pointing left, right, or up) that appeared immediately after the cue for 175 ms before being masked. The dependent measure was proportion of correct arrow identifications out of 90 trials.
