14% in basal insectivores: 80% in humans %
||Herculano-Houzel S, Mota B, Lent R. Cellular scaling rules for rodent brains. Proc Natl Acad Sci U S A. 2006 Aug 8 103(32):12138-43. p.12138 left column bottom paragraphPubMed ID16880386
||Frahm, H. D., Stephan, H. & Stephan, M. (1982) Comparison of brain structure volumes in Insectivora and Primates. I. Neocortex. J. Hirnforsch. 23, 375–389PubMed ID7161477
||"...although the neocortical fraction of brain volume increases from 14% in basal insectivores to 80% in humans (primary source), the cerebellar fraction varies
little across individuals of different mammalian orders (10), a discrepancy that the latter authors take to argue against the hypothesis that the cerebellum works in service of the neocortex."