Figure 1.

A cladogram showing the phylogenetic relationship of five different mammals with each branching point indicating the time of the last common ancestor. Brains are drawn to (relative) scale except the human brain, which is substantially scaled down. The location of the primary somatosensory area, S1 (green), the primary visual area, V1 (yellow), and the posterior parietal cortex (PPC; blue) are depicted. Note that the relative size of the PPC is greatly expanded in primates, particularly in humans. From Goldring and Krubitzer, 2017.