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Equidistant intervals in physical space. Positions of a, c, and vp are identical to those shown in Figure 1(b). (a) AC is divided in four equidistant intervals. The colored dots P are associated with ¼, ½, and ¾ of interval AC, respectively. Identically colored p’s are their proximal stimuli. (b) The three p’s are computed as functions of c relative to a and v. Colors of the lines match the colors of P in (a).
