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AbstractInvestigations into the evolution of the primate brain have generally neglected the role of connectivity in determining which brain structures have changed in size, focussing instead on changes in the size of the whole brain or of individual brain structures, such as the neocortex, in isolation. We show that the primate neocortex, cerebellum and vestibular nuclei exhibit correlated volumetric evolution. At a relatively fine-grained level of resolution, the evolutionary correlations correspond to known patterns of connectivity among these structures (amongst specific nuclei, for example). These results support the idea that brains evolved by mosaic size change in arrays of connected structures. Furthermore, they suggest that the much discussed expansion of the primate neocortex should be re-evaluated in the light of conjoint cerebellar expansion.Whiting & Barton 3