Saccade processing

We analyzed the data using Data Viewer (SR Research Ltd, Mississauga, Ontario, Canada)¹⁴. Trials were rejected and omitted from analyses if the participant: 1) blinked after the target turned on and before the primary saccade was made¹⁵ (n = 239), 2) made an anticipatory saccade (latency ≤90ms¹⁶) (n = 84), or 3) had a primary saccade latency greater than 1000ms likely due to inattention (n = 28). We included the remaining 3249 usable trials in all subsequent analyses. To evaluate inhibitory control, we calculated the prosaccade error rate. A prosaccade error occurred when a participant looked toward the target instead of in the opposite direction to the mirror-image location (Figure 1C). A prosaccade error was determined by comparing the direction of the primary saccade to the location of the target. We calculated the observed prosaccade error rate by finding the percentage of trials when a prosaccade error occurred. Additionally, we evaluated primary saccade latency, the reaction time between target onset and saccade onset, for correct antisaccade and prosaccade error trials.