Figure 5.
Change in contrast response functions with different r2 cutoffs. Contrast response functions for V1, V2 and V3 are shown in A, B and C respectively. Curves are constructed with voxels exceeding a cutoff r2 value the same as Figure 4 (most saturated colors and thickest lines) and with cutoff values 0.11, 0.1, 0.09, 0.08, 0.05 and 0 (in descending order of color saturation and line thickness). Note that the curve with cutoff of 0 is one that is equivalent to an ROI based approach because it includes all voxels in the ROI.