We administered a standard three-condition visual target detection task, programmed using E-Prime software (Psychology Software Tools Inc., 2007). The task featured 280 stimuli, presented over approximately 6.5 minutes in a predetermined semi-randomized order. The three different stimulus types were: (a) the standard stimulus (a small hollow white square, accounting for 75% of all stimulus presentations); (b) the target stimulus (a small white X, 12.5% of all stimulus presentations); and (c) the rare non-target stimulus (different shapes of various colors, 12.5% of all stimulus presentations). Participants were instructed to press a response box button only when they saw the target stimulus. Each stimulus appeared on a black screen for 200 ms; the inter-stimulus interval was 1000–1100 ms. Each participant was shown examples of the stimuli and was given a chance to practice the task before data acquisition began. These stimuli were identical those used in our previous work (Fein and Andrew, 2011; Fein and Chang, 2006).
