Figure 13.

Experiment 3: Orientation. Conservation of critical spacing (red). 65% thresholds are estimated from each observer's psychometric functions. Thresholds for center spacing (red) and edge spacing (blue) are compared for conditions with small and large flankers. Targets are always small. Thresholds do not differ significantly when measured in terms of center distances in both visual fields for both the circumferential configuration and the radial configuration. Error bars indicate plus or minus one standard error about the mean (three observers). Linear fits are shown.