“…Although Kraepelin (1919Kraepelin ( /1971) had mentioned the potential significance of Diefendorf and Dodge's (1908) finding, not until a study by Holzman, Proctor, and Hughes (1973) was this interesting area of investigation further pursued. The Holzman et al study, along with numerous other reports (Bartfai, Levander, & Sedvall, 1983;Blackwood, St. Clair, & Muir, 1988;Cegalis & Sweeney, 1979Holzman, Levy, & Proctor, 1976;Holzman et al, 1974;lacono, Peloquin, Lumry, Valentine, & Tuason, 1982;lacono, Tuason, & Johnson, 1981;Kuechenmeister, Linton, Mueller, & White, 1977;Kufferle, Grunberger, Linzmayer, & Saletu, 1988;May, 1979;Mialet & Pichot, 1981;Pass, Salzman, Klorman, Kaskey, & Klein, 1978;Rea, Sweeney, Solomon, Walsh, & Frances, 1989;Scarone, Gambini, Hafele, Bellodi, & Smeraldi, 1987;Shagass, Amadeo, & Overton, 1974;Shagass, Roemer, & Amadeo, 1976;Spohn, Coyne, & Spray, 1988), demonstrated that persons with schizophrenia have less accurate smooth pursuit eye movements than normal persons and nonpsychotic (personality-disordered and unipolar-depressive-disordered) patients. Some studies, however, have failed to find a significant difference between accuracy of smooth pursuit in persons with schizophrenia and in other groups, especially patients with bipolar affective disorder (Holzman, Solomon, Levin, & Waternaux, 1984;lacono & Koenig, 1983;lacono et al, 1982;Klein, Salzman, Jones, & Ritzier, 1976;Lipton, Levin, & Holzman, 1980;Pivik, 1979aPivik, , 1979bSalzman, Klein, & Strauss, 1978;…”