Neocortex size and social network size in primates

Citation
H. Kudo et Rim. Dunbar, Neocortex size and social network size in primates, ANIM BEHAV, 62, 2001, pp. 711-722
Citations number
100
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Animal Sciences","Neurosciences & Behavoir
Journal title
ANIMAL BEHAVIOUR
ISSN journal
0003-3472 → ACNP
Volume
62
Year of publication
2001
Part
4
Pages
711 - 722
Database
ISI
SICI code
0003-3472(200110)62:<711:NSASNS>2.0.ZU;2-Q
Abstract
Primates use social grooming to service coalitions and it has been suggeste d that these directly affect the fitness of their members by allowing them to reduce the intrinsic costs associated with living in large groups. We te sted two hypotheses about the size of grooming cliques that derive from thi s suggestion: (1) that grooming clique size should correlate with relative neocortex size and (2) that the size of grooming cliques should be proporti onal to the size of the groups they have to support. Both predictions were confirmed, although we show that, in respect of neocortex size, there are a s many as four statistically distinct grades within the primates (including humans). Analysis of the patterns of grooming among males and females sugg ested that large primate social groups often consist of a set of smaller fe male subgroups (in some cases, matrilinearly based coalitions) that are lin ked by individual males. This may be because males insert themselves into t he interstices between weakly bonded female subgroups rather than because t hey actually hold these subunits together. (C) 2001 The Association for the Study of Animal Behaviour.