灵长类动物和食肉动物额叶皮质的缩放比例。
The scaling of frontal cortex in primates and carnivores.
作者信息
Bush Eliot C, Allman John M
机构信息
Biology Division, California Institute of Technology, Pasadena, CA 91125, USA.
出版信息
Proc Natl Acad Sci U S A. 2004 Mar 16;101(11):3962-6. doi: 10.1073/pnas.0305760101. Epub 2004 Mar 8.
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 primates 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, 1.06-1.30) for primates, which is significantly greater than isometric. It is also significantly greater than the carnivore value of 0.94 (95% confidence interval, 0.82-1.07). This finding supports the idea that there are substantial differences in frontal cortex structure and development between the two groups.
大脑的大小对其结构有着深远的影响。许多脑结构呈现异速生长，也就是说，它们的相对大小会随着脑容量的变化而系统性地改变。在此，我们运用独立对比分析，研究了43种哺乳动物（包括25种灵长类动物和15种食肉动物）额叶皮质的异速生长情况。我们发现灵长类动物和食肉动物在异速生长方面存在显著差异的证据。相对于新皮质的其他部分和大脑的其他部分，灵长类动物的额叶皮质呈超比例生长。灵长类动物额叶皮质与皮质其他部分对比的斜率为1.18（95%置信区间为1.06 - 1.30），这显著大于等比例生长。它也显著大于食肉动物的0.94（95%置信区间为0.82 - 1.07）。这一发现支持了这样一种观点，即两组动物在额叶皮质结构和发育方面存在实质性差异。
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