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. Author manuscript; available in PMC: 2020 Sep 1.
Published in final edited form as: Cortex. 2019 Feb 22;118:223–243. doi: 10.1016/j.cortex.2019.02.010

Figure 1.

Figure 1.

Evolutionary relationships and divergence times among the three primate species examined here. Chimpanzees (Pan troglodytes), along with bonobos, are the closest living relatives of humans (Homo sapiens); both belong to the hominoid group. Rhesus macaques (Macaca mulatta) belong to the Old World monkey group, which is the sister group of the hominoids. Divergence dates are from (Steiper and Seiffert 2012), (Finstermeier et al. 2013), (Perelman et al. 2011), and (Wilkinson et al. 2011). Brain photographs are from the Comparative Mammalian Brain Collections website (www.brainmuseum.org).