Antisocial behavior, substance use, and impulsive and aggressive personality traits often co-occur, forming a coherent spectrum of personality and psychopathology. In the current research, the authors developed a novel quantitative model of this spectrum. Over 3 waves of iterative data collection, 1,787 adult participants selected to represent a range across the externalizing spectrum provided extensive data about specific externalizing behaviors. Statistical methods such as item response theory and semiparametric factor analysis were used to model these data. The model and assessment instrument that emerged from the research shows how externalizing phenomena are organized hierarchically and cover a wide range of individual differences. The authors discuss the utility of this model for framing research on the correlates and the etiology of externalizing phenomena.
Keywords drug; alcohol; impulsivity; aggression; classificationThe existence of individual differences in the tendency to contain versus express impulses has been recognized in academic psychology since its inception as a discipline (James, 1890(James, /1983. In more recent times, this domain has been instantiated in psychological constructs ranging from disinhibition (Clark & Watson, 1999;Gorenstein & Newman, 1980) to impulsivity (Barratt, 1994;Dickman, 1990;Gray, 1981;Whiteside & Lynam, 2001), ego control (J. Block, 1965; J. H. Block & Block, 1980), constraint (Tellegen, 1985), the problem behavior syndrome (Jessor & Jessor, 1977), sensation seeking (Zuckerman & Kuhlman, 2000), and novelty seeking (Cloninger, Svrakic, & Przybeck, 1993). In addition, a dimension of effortful control is a salient feature of childhood temperament that likely relates to these disinhibitory personality characteristics in adulthood (Rothbart, Ahadi, & Evans, 2000). Robust correlations have also been observed between these disinhibitory personality constructs and mental disorders involving substance problems and antisocial behavior (for a review, see Sher & Trull, 1994).In spite of these rich interrelations, many of these constructs continue to be studied and conceptualized as separate entities, in separate literatures. A major reason for this fragmentation is the lack of an integrative model of this domain (Widiger & Clark, 2000). The purpose of the current research is to further the development of an empirically based model of
NIH-PA Author ManuscriptNIH-PA Author Manuscript NIH-PA Author Manuscript this broad domain of personality and psychopathology, which we term the externalizing spectrum (Krueger, Markon, Patrick, & Iacono, 2005).
Origins of the Externalizing Spectrum ConceptualizationAs applied to adult psychopathology, the externalizing spectrum conceptualization emerged initially from research on mental disorders defined within current nosologies. In the Diagnostic and Statistical Manual of Mental Disorders (4th ed., text. rev.; DSM-IV-TR; American Psychiatric Association, 2000), various forms of substance problems are conceptualized as discrete disorder...