Kaas Jon H
Department of Psychology, Vanderbilt University, Nashville, TN 37240-7817, USA.
Brain Behav Evol. 2011;78(1):7-21. doi: 10.1159/000327316. Epub 2011 Jun 17.
The fossil record indicates that early mammals had small brains with proportionately little neocortex. Here we consider what is known about the organization of the neocortex in species with the least expanded neocortex from 6 major clades of the mammalian radiation. Common features of the neocortex across these clades include primary and secondary sensory areas, retrosplenial and cingulate cortex, and frontal cortex. Overall, early mammals likely had a core of 15-20 cortical areas that have been retained in most present-day mammals.
化石记录表明,早期哺乳动物的大脑较小,新皮层相对较少。在这里,我们研究了哺乳动物辐射演化的6个主要分支中,新皮层扩张程度最小的物种的新皮层组织情况。这些分支的新皮层的共同特征包括初级和次级感觉区域、压后皮质和扣带皮质以及额叶皮质。总体而言,早期哺乳动物可能有15 - 20个皮质区域的核心,这些区域在大多数现代哺乳动物中得以保留。