In the early 1990s, the group of C. Robert Cloninger developed a psychobiological model of personality, which has produced a large body of work and inspired many researchers. It was conceived as a dimensional and two-tiered model, accounting for both normal and abnormal variations in two major components of personality: Temperament and Character (Cloninger, 1994a, 1994b; Cloninger and Svrakic, 1997; Cloninger et al. 1993).