“…Impulsive behaviors typically are quick, often inappropriate, and frequently risky. People who are highly impulsive are prone to a host of high-risk behaviors characterized by poor self-control (e.g., Hoyle, Fejfar, & Miller, 2000;Krueger, Caspi, Moffitt, White, & Slouthamer-Loeber, 1996;Wulfert, Block, Ana, Rodriguez, & Colsman, 2002). Although impulsivity can be assessed, and often is studied, as a trait, it also appears as a constituent of broader traits and domains of personality such as extraversion and psychoticism in the P-E-N model (Psychoticism, Extraversion, and Neuroticism; Eysenck, 1990), conscientiousness in the five-factor model (Costa & McCrae, 1992), impulsive sensation seeking in the alternative five-factor model (Zuckerman, Kuhlman, Joireman, Teta, & Kraft, 1993), and the behavioral approach system in Gray's (1994) neurophysiological model.…”