A number of different tasks have been developed to index these various cognitive processes; a non-exhaustive list of examples of these tasks is presented in Table 2. Similar to the questionnaire-based literature, different tasks show varying degrees of correlation. For example, Friedman & Miyake (2004) found that prepotent response inhibition and resistance to distractor interference correlated highly (r = 0.67), and neither correlated with resistance to proactive interference. Furthermore, they found some evidence supporting the validity of the distinction between the first two tasks and the third task, in that they had different external correlates. In fact, different cognitive tasks have been related to a number of different relevant external criteria. For example, both adolescents with disruptive behavior disorders and suicidal individuals demonstrate difficulties inhibiting already initiated responses. In addition, adolescents with disruptive behavior disorders, psychopaths and aggressive/suicidal individuals all tend to choose more immediate, smaller rewards rather than wait for larger rewards (Dougherty et al. 2005b). These individuals also show state-level increases in some impulsive behaviors as a function of alcohol consumption, whereby alcohol consumption leads to more errors
