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The psychometric function for discriminating the location of the illusory contour for a Kanizsa square formed from solid “pacmen” (top panel), for a Kanizsa square formed from “bull’s-eye pacmen” (middle panel), and for horizontally phase-shifted vertical lines (bottom panel). Results for three observers as well as their averages (black squares) are shown in each panel. The arrows indicate the distances between the yellow square and the contour in the previous experiment.
