Figure 5.

Comparison of dog domestication and human self-domestication. Illustration modified from Theofanopoulou et al. (2017) [45]. Photographs of the skull of modern man (Homo sapiens) and prehistoric man (Homo neandertalensis) are from commons.wikimedia.org. Similar to differences between dog and wolf, note that the skull of modern man is much more neotenic compared to the skull of a Neanderthal (smaller skull and brain, oval forehead, less protruded nasal bone, smaller teeth, orthognathia), which can be said to be gerontomorphic.