Neocortical development and social structure in primates |
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Authors: | Toshiyuki Sawaguchi Hiroko Kudo |
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Institution: | (1) Kyoto University, Japan;(2) Present address: Section of Neuroanatomy, Yale University School of Medicine, 333 Cedar Street, 06510 New Haven, Connecticut, U.S.A.;(3) Present address: Japan Monkey Centre, 484 Inuyama, Aichi, Japan |
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Abstract: | The relationships between the relative size of the neocortex and differences in social structures were examined in prosimians
and anthropoids. The relative size of the neocortex (RSN) of a given congeneric group in each superfamily of primates was
measured based on the allometric relationships between neocortical volume and brain weight for each superfamily, to control
phylogenetic affinity and the effects of brain size. In prosimians, “troop-making” congeneric groups (N=3) revealed a significantly larger RSN than solitary groups (N=6), and there was a significant, positive correlation between RSN and troop size. In the case of anthropoids, polygynous/frugivorous
groups (N=5) revealed a significantly larger RSN than monogynous/frugivorous groups (N=8). Furthermore, a significant, positive correlation between RSN and troop size was found for frugivorous congeneric groups
of the Ceboidea. These results suggest that neocortical development is associated with differences in social structure among
primates. |
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Keywords: | Neocortex Relative size Allometry Congeneric group Social structure Monogyny Polygyny Primates |
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