Rilling J K, Insel T R
Department of Anthropology, Yerkes Regional Primate Research Center, Emory University, Atlanta, GA 30322, USA.
Neuroreport. 1999 May 14;10(7):1453-9. doi: 10.1097/00001756-199905140-00012.
Whole brain MRI scans from 11 primate species (43 individuals) spanning more than a 50-fold range in brain volume were used to determine whether the corpus callosum keeps pace with the growth of the forebrain among living anthropoid primates. Interhemispheric connectivity via the corpus callosum and anterior commissure was reduced in larger primate brains, whereas intrahemispheric connectivity was augmented. We also show that the splenium constitutes an increasing proportion of callosal area with increasing brain size. This may function to maintain rapid integration of the left and right visual space as brain size increases. These results indicate that the evolution of larger brain size in primates results in increasingly independent hemispheres.
来自11种灵长类物种（43个个体）的全脑MRI扫描数据被用于确定胼胝体是否能跟上现存类人猿灵长类前脑的生长速度，这些灵长类物种的脑容量跨度超过50倍。在较大的灵长类动物大脑中，通过胼胝体和前连合的半球间连接减少，而半球内连接增强。我们还表明，随着脑容量增加，胼胝体压部在胼胝体区域中所占比例越来越大。这可能有助于在脑容量增加时维持左右视觉空间的快速整合。这些结果表明，灵长类动物中较大脑容量的进化导致半球越来越独立。
