APPARENT PROPERTIES OF INSPECTION FIGURES AS DETERMINERS OF FIGURAL AFTER‐EFFECTS

Figural after‐effects (FAE) were studied using the Hering, the Ehrenstein, and the Orbisson illusion, patterns in two ways. In one condition, the total pattern was used as inspection figure (IF), and that part of the pattern in which the illusion normally appears, as test figure (TF). The resulting FAE was in a direction opposite to that of the illusion. In the second condition, the illusion producing part of the total pattern served as IF, and the illusion suffering part as TF. This produced an after‐effect, the direction of which was the same as that of the illusion.