Our paper on brain evolution in hominins and other primates is out. Amongst other things, we find a pattern of directional increase in relative brain size in hominins which accelerated toward the present (consistent with idea of positive feedback)
"In conclusion, we provided robust evidence for directional and accelerating selection towards larger brain size over the course of human evolution, resulting in the human brain being exceptionally large for a primate of similar body mass."
A new study argues that unusual size of the human brain is due to progressive scaling shifts over millions of years, but refutes idea that relative expansion of neocortex is a hallmark of our species. Evolution of subcortical structures also key.
#GreatAdaptations How humans brains got big (hint, it's not how you thought) Quantitative uniqueness of human brain evolution revealed through phylogenetic comparative analysis