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Durham Research Online
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Binocularity and brain evolution in primates.

Barton, R. A. (2004) 'Binocularity and brain evolution in primates.', Proceedings of the National Academy of Sciences of the United States of America., 101 (27). pp. 10113-10115.

Abstract

Primates are distinguished by frontally directed, highly convergent orbits, which are associated with stereoscopic vision. Although stereoscopic vision requires specialized neural mechanisms, its implications for brain evolution are unknown. Using phylogenetic comparative analysis, I show that evolutionary increases among primate taxa in the degree of orbital convergence correlate with expansion of visual brain structures and, as a consequence, with the overall size of the brain. This pattern is found across the whole primate order and is also repeated within each of the two major primate subtaxa. The visual expansion associated with increased binocularity is specific to the parvocellular visual pathway, consistent with recent evidence implicating this pathway in fine-grained stereopsis. The results support the hypothesis that brain size evolution in primates was associated with visual specialization.

Item Type:Article
Full text:Full text not available from this repository.
Publisher Web site:http://dx.doi.org/10.1073/pnas.0401955101
Record Created:16 May 2007
Last Modified:30 Jul 2010 16:15

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