Figure 1.

(A) Example static frame from the dynamic displays in Experiment 1A. The top (above rectangular occluder) black-and-white section is the unbiased-section (no dots) in this example, whereas the bottom section (below rectangular occluder) is the biased-section with texture dots on both sides of the edge. Edge-assignment for the edge within the biased-section was determined by local edge-assignment cues, namely the relationship between the motion of the edge and the dots in the two regions (see main text). The color of the central ‘occluding’ horizontal bar was red in the actual displays. Animated color versions of all displays are available in the Supplemental Materials. (B) Annotated cartoon of the motion for different sections of the display in the edges-grouped with similar-region-color condition. Arrows within a region indicate relative direction of motion for dotted region texture. Arrows above or below a section indicate the relative motion direction of the vertical dividing edge for that section. The frequencies listed indicate the rate of oscillation associated with that display element (e.g. 1.0 Hz below a region arrow indicates a 1.0 Hz oscillation for texture dots in that region). “F” and “G” indicate anticipated figural or ground status (respectively) within the biased-section due to dot motion in relation to edge motion, as was confirmed by phenomenal judgments for the biased section. (C) Edge-only grouped condition, region-color-dissimilar. (D) Edges-ungrouped with region-color-similar condition. (E) Edges-ungrouped with region-color-dissimilar condition. Blue and green region colors are replaced by dark gray and light gray here. In the actual displays the blue and green were equiluminant (by flicker photometry for each participant) with the “black” (dark gray) and “white” (light gray) of the unbiased-section, respectively.