Figure 11.

Experiment 2: Size, jagged rectangles. Critical edge spacing (blue) is conserved. 65% thresholds are estimated from each observer's psychometric functions. Thresholds for center, edge, and centroid spacing (red, blue, and green) are compared. Thresholds are only consistent when measured in terms of edge spacing 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). Linear fits are shown.