“…Many investigators have been interested in the interaction of binocular and monocular cues. Quite a few have varied monocular cues (Banks & Backus, 1998;Buckley & Frisby, 1993;Clark, Smith, & Rabe, 1956;Frisby, Buckley, & Horsman, 1995;Frisby, Buckley, & Freeman, 1996;Gillam, 1968;Gillam & Ryan, 1992;Harwerth et al, 1998;Ryan & Gillam, 1994;Smith, 1967;Stevens & Brookes, 1988;van Ee, Banks, & Backus, 1999;Youngs, 1976), and others have gone so far as to present binocular cues that specified a depth sign that was opposite to the depth sign specified by monocular cues (Allison & Howard, 2000a;Allison & Howard, 2000b;Braunstein, Andersen, Rouse, & Tittle, 1986;Bülthoff & Mallot, 1988;Bülthoff & Mallot, 1990;Dosher, Sperling, & Wurst, 1986;Gillam & Cook, 2001;Rogers & Collett, 1989;Turner, Braunstein, & Andersen, 1997;van der Meer, 1979). Most of the above-mentioned studies, however, were not concerned primarily with the study of bi-stability.…”