Using a battery of neurocognitive tasks, we assessed the following three prefrontally-mediated executive cognitive functions: Working Memory, Cognitive Control, and Reward Processing. Although these three functions are sufficiently distinct in their functions to merit the label “system,” and can be assessed by separate sets of tasks, it is also true that they operate in concert (Duncan & Owen, 2000). Accordingly, the tasks included here were intended to place disproportionately heavy demands on a particular system, not to cleanly isolate that system (Huizinga, Dolan, & van der Molen, 2006; Miyake et al., 2000; Miyake, Friedman, Rettinger, Shah, & Hegarty, 2001). All but one, the Digit Span subtest from the Wechsler Intelligence Scale for Children-IV,(Wechsler, 2003) were administered using laptop computers.
