However, impulsivity is a loose term, and there is good evidence from other literatures that impulsivity is not a unitary construct (Smith et al., 2007; Whiteside & Lynam, 2001). Depue and Collins (1999) aptly stated: ‘Impulsivity comprises a heterogeneous cluster of lower-order traits that includes terms such as impulsivity, sensation-seeking, risk-taking, novelty-seeking, boldness, adventuresomeness, boredom susceptibility, unreliability, and unorderliness’ (p. 495). Further compounding this problem is the fact that there are many different questionnaires that have been designed to measure these aspects of impulsivity. The constructs assessed in these measures often vary considerably, with some measures of impulsivity reflecting a failure to plan ahead, and others focusing more on engagement in risky behavior. These different measures, referred to as measures of impulsivity, are not very correlated, and do not load on a single factor; this is true of both questionnaire-based and laboratory-based measures of impulsivity (Dick et al., 2010). Interestingly, recent studies suggest that different aspects of impulsivity appear to be differentially related to different aspects of alcohol use (Smith et al., 2007). Yet, despite growing recognition that impulsivity is
