with theories of PFC function that place particular emphasis on this ability. It is quite likely that youth who have limited ability to consider multiple and potentially conflicting goals are less likely to think before acting and to temper their interest in novel and exciting experiences. This would lead them to develop a relatively stable style of behavior that is observed in trait measures of impulsivity. Working memory capacity is also strongly related to general cognitive ability as assessed in intelligence tests (Colom, Abad, Quiroga, Shih, & Flores-Mendoza, 2008; Shamosh et al., 2008). It is possible therefore that working memory capacity is responsible for the small but persistent correlation that has been observed between IQ and youth engagement in multiple risk behaviors (Henry & Moffitt, 1997; Lynam, Moffitt, & Stouthamer-Loeber, 1993).
