Fig. 8.

Judgment of the apparent position of two half-bars displayed simultaneously at different positions, either at −20 and 0° (filled and open triangles, respectively) or at 0 and 20° (open and filled circles, respectively), while observers made 20° horizontal saccades. The results for half-bars shown in pairs are similar to those for single isolated bars. The bottom curves show the apparent separation of the bars for the two conditions. Whereas the −20/0° (triangles) pair maintains a veridical separation of −20° at all delays, the separation of the 0/20° pair (circles) shrinks just before saccadic onset, when they appear to be colinear.