Figure 5.

Relative frequency proportions of the main filled-in percepts along the inner edge (I → A, top panels; and A → I, middle panels) and outer edge (O → A, bottom panels) as a function of contrast magnitude at the corresponding edge. Positive and negative contrast values represent the conditions when the two edges have the same versus opposite contrast polarity. The left panels show data for the l contrast stimuli in Experiment 1 and for the l inner-outer pair stimuli in Experiment 2. The right panels show data for the s contrast stimuli in Experiment 1 and for the s inner-outer pair stimuli in Experiment 2.