Blatt and Levy place attachment theory and research in a broad theoretical matrix by considering the relationship of attachment patterns to personality development and to different types of psychopathology in adults. Thus Blatt and Levy construct conceptual bridges between the two configurations of personality development and psychopathology that Blatt and colleagues have developed over the past quarter century (e.g., Behrends and Blatt, 1985; Blatt, 1974, 1995; Blatt and Behrends, 1987; Blatt and Blass, 1990, 1996; Blatt and Shichman, 1983) and attachment theory and research. Blatt and Levy identify a polarity that is central to attachment theory and research, the polarity of attachment and separation, and they note that this polarity has also been central in much of classic psychoanalytic theory (e.g., Freud, 1930; Loewald, 1962). This polarity is expressed in attachment theory and research in the differences between avoidant and anxious-preoccupied insecure attachment patterns as well in the distinction between two types of disorganized attachment, helpless withdrawn and negative intrusive, identified by Lyons-Ruth (1999, 2001).