. Advances in the study of mammalian behavior. Mammals. 122 Spec. Publ. Amer. Soc. Mamm. 7 4 I 1 1 1 1 r. LOG VOLUME Fig. 3. "Regression" line from Fig. 6 (heavy solid line) and equivalent line from cortical surface-cerebral hemisphere regression superimposed on diagonal lines rep- resenting surface-volume relations in sectored spheres (see text). in Fig. 3. The solid heavy diagonal in Fig. 3 is the regression line of Fig. 2. (The dashed diagonal is a regression line from an analysis of cortical surface as a function of the volume of the cerebral hemi- spheres rather than the whole b
. Advances in the study of mammalian behavior. Mammals. 122 Spec. Publ. Amer. Soc. Mamm. 7 4 I 1 1 1 1 r. LOG VOLUME Fig. 3. "Regression" line from Fig. 6 (heavy solid line) and equivalent line from cortical surface-cerebral hemisphere regression superimposed on diagonal lines rep- resenting surface-volume relations in sectored spheres (see text). in Fig. 3. The solid heavy diagonal in Fig. 3 is the regression line of Fig. 2. (The dashed diagonal is a regression line from an analysis of cortical surface as a function of the volume of the cerebral hemi- spheres rather than the whole brain and the results of w^hich were almost identical to those for the whole brain although displaced as indicated in Fig. 3.) Small-brained species have smooth brains and are near the one-sectored sphere-lines. Humans, elephants, and whales have highly fissured brains and are between the eight-sec- tored and 16-sectored sphere-lines. According to these results we should expect the amount of fis- surization in the brains of different species to be determined almost entirely by the size of the brain. Elias and Schwartz (1971) mea- sured the relationship, and their results are presented in Fig. 4. It is as orderly as anticipated; a quantitative analysis leads to addi- tional insights into the evolution of fissurization and suggests some. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Eisenberg, John Frederick; Kleiman, Devra G; American Society of Mammalogists. [Shippensburg, Pa?] : American Society of Mammalogists
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