Research leading to the identification of the urgency traits has stemmed from the recognition that the terms “impulsivity” and “disinhibition” have, in fact, denoted combinations of multiple, separate psychological constructs (Bagby, Joffe, Parker, & Schuller, 1993; Depue & Collins, 1999; Evenden, 1999; Eysenck & Eysenck, 1977; Petry, 2001; Smith et al., 2007a; Whiteside & Lynam, 2001; Zuckerman, 1994). Among the efforts to identify separate constructs within the “impulsivity” umbrella, the work of Whiteside and Lynam (2001) may be particularly informative.
