Figure 1.

Example of “dead leaves” stimuli employed in the study for each eccentricity condition (a–d). For each of these four example stimuli, the top, right, and bottom quadrants are blurred with 0.5 arcmin of “pedestal” blur, whereas the left quadrant is blurred by a greater amount of blur (0.5 + 6 arcmin of “pedestal” + “increment” blur). For the 0° condition (a), blur is present throughout the entire image from the center to the periphery. In the peripheral blur testing conditions (b–d), the image within the central 4°, 8°, or 12°, respectively, were sharply rendered, and blur was present only at an eccentricity beyond 4° (b), 8° (c), or 12° (d).