“…Substantial evidence has accumulated that is consistent with this model of affect. Principal-components analyses of self-reported affect and multidimensional-scaling analyses of similarity judgments of affective states have suggested that affective states form a circular pattern in two-dimensional space (e.g., Block, 1957; Bush, 1973; Feldman, 1995a, 1995b; Feldman Barrett & Russell, 1998; Howarth & Young, 1986; Meyer & Shack, 1989; Russell, 1978, 1980; Russell & Mehrabian, 1977; Russell & Pratt, 1980; Russell & Steiger, 1982; Rusting & Larsen, 1995; Watson & Tellegen, 1985; Zevon & Tellegen, 1982). Analyses of judgments of facial expressions of emotion have also suggested a circular structure (e.g., Abelson & Sermat, 1962; Cliff & Young, 1968; Dittmann, 1972; Fillenbaum & Rapoport, 1971; R.…”