Primate brain growth exceeded body size, enhancing cognition and sociability

Primates' brains grew later than their bodies, a reanalysis of 1999 data suggests. This supports a long-standing hypothesis about primate evolution. The new study found that primate brains not only caught up to body size but exceeded it, leading to enhanced cognitive abilities and increased sociability. This brain growth is linked to the evolution of larger social groups for protection and potentially supported by dietary shifts.