Figure 8
This plot illustrates how suppression zones change as a function of contrast energy. Different shapes of the markers indicate different spatial frequencies while the grayscale shades indicate the contrast level. Any contrast energy level could result in multiple suppression zones. The inset shows that a DoG at lower spatial frequency with low contrast can have equivalent contrast energy to a DoG at a higher spatial frequency with high contrast. The suppression zone width can vary even with a single value of contrast energy. Contrast energy alone is not enough to explain the spatial extent of the suppression zone.
