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- W156780079 endingPage "96" @default.
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- W156780079 abstract "The patterns of relative brain allometry in mammals, particularly disproportional enlargement or reduction of the volumes of particular brain subdivisions with respect to overall brain volume, are well predicted by a conserved order of neurogenesis. Developmentally late-generated structures become disproportionately large as the brain enlarges. The cortex is the most extreme example of this principle. The origin of each brain subdivision with respect to the anterior-to-posterior, medial-to-lateral axes of the forebrain prosomeres and hindbrain rhombomeres is the principal embryonic correlate of the relative duration of neurogenesis. The number of cortical areas increases as a regular function of total cortical area. Comparative studies in combination with this observation suggest that cortical areas result from three different organizing mechanisms: a set of primary sensory regions that are genetically specified and conserved across mammalian brains, a second set arising from axonal sorting interactions in relatively small brains similar to other topographic specializations such as ocular dominance columns in larger brains, and a final set of areas arising by unknown mechanisms at the very largest brain sizes. The insensitivity of the relative size of cortical areas to environmental niche, in combination with many observations of the ease of developmental reallocation of cortex suggests that genetic selection on the size of particular cortical areas is not a common evolutionary event. Exploratory studies of the scaling properties of neural nets suggest that the apparently energetically wasteful coordinated scaling of brain with body size, and sensory and motor systems with each other may be required to protect computational resources that become disrupted by uncoordinated scaling." @default.
- W156780079 created "2016-06-24" @default.
- W156780079 creator A5058358634 @default.
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- W156780079 date "2007-01-01" @default.
- W156780079 modified "2023-10-18" @default.
- W156780079 title "Cortical Evolution as the Expression of a Program for Disproportionate Growth and the Proliferation of Areas" @default.
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