Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12136/66
|Title:||Evidence for expansion of the precuneus in human evolution|
Preuss, Todd M.
Rilling, James K.
|Keywords:||Parietal lobes;Human evolution;Evolutionary neuroanatomy;Morphometrics|
|Citation:||Brain Structure and Function, 2017, 222 (2), 1035-1060|
|Abstract:||The evolution of neurocranial morphology in Homo sapiens is characterized by bulging of the parietal region, a feature unique to our species. In modern humans, expansion of the parietal surface occurs during the first year of life, in a morphogenetic stage which is absent in chimpanzees and Neandertals. A similar variation in brain shape among living adult humans is associated with expansion of the precuneus. Using MRI-derived structural brain templates, we compare medial brain morphology between humans and chimpanzees through shape analysis and geometrical modeling. We find that the main spatial difference is a prominent expansion of the precuneus in our species, providing further evidence of evolutionary changes associated with this area. The precuneus is a major hub of brain organization, a central node of the default-mode network, and plays an essential role in visuospatial integration. Together, the comparative neuroanatomical and paleontological evidence suggest that precuneus expansion is a neurological specialization of H. sapiens that evolved in the last 150,000 years that may be associated with recent human cognitive specializations.|
|Appears in Collections:||Paleobiología|
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|Evidence for expansion_Bruner_et_al_Brain_Struct_Funct_2017.pdf||1,48 MB||Adobe PDF||View/Open|
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