Recently , diet , life span and population density were associated to directly act on primate brain sizes , especially the neocortex (Walker et al , 2006 . Mechanisms behind such increase in size involves generation of a large brain which consequently programs the body to increase food intake and lengthen its life span to be able to substantially maintain and develop a bigger brain . The brain has also evolved to accommodate changes for social interactions (Dunbar and Shultz , 2007 . Sexual selection is also involved...
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