At the Wave 2 session, participants completed nine computerized tasks selected to tap three executive functions—response inhibition, working memory updating, and task-set shifting. Because our primary hypothesis concerned response inhibition, we present detailed methods for the three response inhibition tasks. However, to verify that response inhibition does in fact show discriminant validity in its relation to behavioral disinhibition, we also conducted one set of analyses that included the other two executive functions. Hence, we also briefly describe the essential requirements for the six additional executive function tasks (for additional details of the tasks, see Friedman et al., 2008). Task administration was computerized (Macintosh iBook computers) in PsyScope 1.2.5 (Cohen, MacWhinney, Flatt, & Provost, 1993). A button box with millisecond accuracy was employed for the tasks using reaction time (RT) measures, and a voice key was attached to the button box to record RTs for verbal responses.
