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Primates

, Volume 31, Issue 2, pp 283–289 | Cite as

Neocortical development and social structure in primates

  • Toshiyuki Sawaguchi
  • Hiroko Kudo
Short Communication

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.

Key Words

Neocortex Relative size Allometry Congeneric group Social structure Monogyny Polygyny Primates 

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Copyright information

© Japan Monkey Centre 1990

Authors and Affiliations

  • Toshiyuki Sawaguchi
    • 1
  • Hiroko Kudo
    • 1
  1. 1.Kyoto UniversityJapan

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