Figure 10.

Experiment 1: Length. Only critical edge spacing (blue) is conserved. 65% thresholds are estimated from each psychometric function. Thresholds for center, centroid, and edge spacing (red, green, and blue, respectively) are compared. Thresholds are consistent across flanker lengths only when measured in terms of edge spacing. This is true in both visual fields for both the circumferential and radial configurations. Error bars indicate plus or minus one standard error about the mean (three observers). The fits are linear regressions.