To ensure that only the visual fibers of the corpus callosum were extracted, one exclusion and one inclusion ROI were introduced, i.e., fibers were excluded if they passed through the exclusion ROI or if they did not pass through the inclusion ROI. The inclusion ROI (coronal) was placed through the posterior edge of the parieto-occipital sulcus, so as to exclude fibers that did not project posteriorly from the corpus, such as temporal callosal fibers (Fig. 3b). The exclusion ROI (axial) was placed on the dorsal-most slice of the corpus callosum, so as to exclude fibers that projected dorsally to the parietal cortex (Fig. 3b). The remaining fibers connected the primary and secondary visual cortices bilaterally (see Fig. 3c and 3d).
