Abstract
Human brain organization is built upon a more ancient adaptation, the large brain of simian primates: on average, monkeys and apes have brains twice as large as expected for mammals of their size, principally as a result of neocortical enlargement. Testing the adaptive benefit of this evolutionary specialization depends on finding an association between brain size and function in primates. However, most cognitive capacities have been assessed in only a restricted range of species under laboratory conditions. Deception of conspecifics in social circumstances is an exception, because a corpus of field data is available that encompasses all major lines of the primate radiation. We show that the use of deception within the primates is well predicted by the neocortical volume, when observer effort is controlled for; by contrast, neither the size of the rest of the brain nor the group size exert significant effects. These findings are consistent with the hypothesis that neocortical expansion has been driven by social challenges among the primates. Complex social manipulations such as deception are thought to be based upon rapid learning and extensive social knowledge; thus, learning in social contexts may be constrained by neocortical size.
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- Armstrong E. Relative brain size and metabolism in mammals. Science. 1983 Jun 17;220(4603):1302–1304. doi: 10.1126/science.6407108. [DOI] [PubMed] [Google Scholar]
- Barton R. A., Harvey P. H. Mosaic evolution of brain structure in mammals. Nature. 2000 Jun 29;405(6790):1055–1058. doi: 10.1038/35016580. [DOI] [PubMed] [Google Scholar]
- Barton R. A. Neocortex size and behavioural ecology in primates. Proc Biol Sci. 1996 Feb 22;263(1367):173–177. doi: 10.1098/rspb.1996.0028. [DOI] [PubMed] [Google Scholar]
- Barton R. A., Purvis A., Harvey P. H. Evolutionary radiation of visual and olfactory brain systems in primates, bats and insectivores. Philos Trans R Soc Lond B Biol Sci. 1995 Jun 29;348(1326):381–392. doi: 10.1098/rstb.1995.0076. [DOI] [PubMed] [Google Scholar]
- Barton R. A. Visual specialization and brain evolution in primates. Proc Biol Sci. 1998 Oct 22;265(1409):1933–1937. doi: 10.1098/rspb.1998.0523. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Boysen S. T., Bernston G. G., Hannan M. B., Cacioppo J. T. Quantity-based interference and symbolic representations in chimpanzees (Pan troglodytes). J Exp Psychol Anim Behav Process. 1996 Jan;22(1):76–86. [PubMed] [Google Scholar]
- Cheney D., Seyfarth R., Smuts B. Social relationships and social cognition in nonhuman primates. Science. 1986 Dec 12;234(4782):1361–1366. doi: 10.1126/science.3538419. [DOI] [PubMed] [Google Scholar]
- Clark D. A., Mitra P. P., Wang S. S. Scalable architecture in mammalian brains. Nature. 2001 May 10;411(6834):189–193. doi: 10.1038/35075564. [DOI] [PubMed] [Google Scholar]
- Deaner R. O., Nunn C. L., van Schaik C. P. Comparative tests of primate cognition: different scaling methods produce different results. Brain Behav Evol. 2000 Jan;55(1):44–52. doi: 10.1159/000006641. [DOI] [PubMed] [Google Scholar]
- Finlay B. L., Darlington R. B. Linked regularities in the development and evolution of mammalian brains. Science. 1995 Jun 16;268(5217):1578–1584. doi: 10.1126/science.7777856. [DOI] [PubMed] [Google Scholar]
- Finlay B. L., Darlington R. B., Nicastro N. Developmental structure in brain evolution. Behav Brain Sci. 2001 Apr;24(2):263–308. [PubMed] [Google Scholar]
- Hare B, Call J, Agnetta B, Tomasello M. Chimpanzees know what conspecifics do and do not see. Anim Behav. 2000 Apr;59(4):771–785. doi: 10.1006/anbe.1999.1377. [DOI] [PubMed] [Google Scholar]
- Hare Brian, Call Josep, Tomasello Michael. Do chimpanzees know what conspecifics know? Anim Behav. 2001 Jan;61(1):139–151. doi: 10.1006/anbe.2000.1518. [DOI] [PubMed] [Google Scholar]
- Joffe T. H., Dunbar R. I. Visual and socio-cognitive information processing in primate brain evolution. Proc Biol Sci. 1997 Sep 22;264(1386):1303–1307. doi: 10.1098/rspb.1997.0180. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Keverne E. B., Martel F. L., Nevison C. M. Primate brain evolution: genetic and functional considerations. Proc Biol Sci. 1996 Jun 22;263(1371):689–696. doi: 10.1098/rspb.1996.0103. [DOI] [PubMed] [Google Scholar]
- Livingstone M., Hubel D. Segregation of form, color, movement, and depth: anatomy, physiology, and perception. Science. 1988 May 6;240(4853):740–749. doi: 10.1126/science.3283936. [DOI] [PubMed] [Google Scholar]
- Purvis A. A composite estimate of primate phylogeny. Philos Trans R Soc Lond B Biol Sci. 1995 Jun 29;348(1326):405–421. doi: 10.1098/rstb.1995.0078. [DOI] [PubMed] [Google Scholar]
- Purvis A., Rambaut A. Comparative analysis by independent contrasts (CAIC): an Apple Macintosh application for analysing comparative data. Comput Appl Biosci. 1995 Jun;11(3):247–251. doi: 10.1093/bioinformatics/11.3.247. [DOI] [PubMed] [Google Scholar]
- Seyfarth Robert M., Cheney Dorothy L. What are big brains for? Proc Natl Acad Sci U S A. 2002 Apr 2;99(7):4141–4142. doi: 10.1073/pnas.082105099. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Stephan H., Frahm H., Baron G. New and revised data on volumes of brain structures in insectivores and primates. Folia Primatol (Basel) 1981;35(1):1–29. doi: 10.1159/000155963. [DOI] [PubMed] [Google Scholar]
- de Winter W., Oxnard C. E. Evolutionary radiations and convergences in the structural organization of mammalian brains. Nature. 2001 Feb 8;409(6821):710–714. doi: 10.1038/35055547. [DOI] [PubMed] [Google Scholar]