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The scaling of frontal cortex in primates and carnivores
 

Summary: The scaling of frontal cortex in primates
and carnivores
Eliot C. Bush* and John M. Allman
Biology Division, California Institute of Technology, Pasadena, CA 91125
Edited by Charles F. Stevens, The Salk Institute for Biological Studies, La Jolla, CA, and approved January 12, 2004 (received for review September 9, 2003)
Size has a profound effect on the structure of the brain. Many brain
structures scale allometrically, that is, their relative size changes
systematically as a function of brain size. Here we use independent
contrasts analysis to examine the scaling of frontal cortex in 43
species of mammals including 25 primates and 15 carnivores. We
find evidence for significant differences in scaling between pri-
mates and carnivores. Primate frontal cortex hyperscales relative to
the rest of neocortex and the rest of the brain. The slope of frontal
cortex contrasts on rest of cortex contrasts is 1.18 (95% confidence
interval, 1.061.30) for primates, which is significantly greater than
isometric. It is also significantly greater than the carnivore value of
0.94 (95% confidence interval, 0.821.07). This finding supports the
idea that there are substantial differences in frontal cortex struc-
ture and development between the two groups.
Comparative neuroanatomists have long been interested in

  

Source: Allman, John M. - Division of Biology, California Institute of Technology

 

Collections: Biology and Medicine