. Advances in the study of mammalian behavior. Mammals. Structure, Development, and Function 139. 25 30 35 200 Copacily or Brain Weight (ml or g) 1000 1500 2000 Fig. 13. Cumulative frequency distributions of brain size, with corresponding normal curves (top). Abbreviations are: B, Bathygenys reevesi (an Oligocene ore- odont); F, felis catus; C, chimpanzee; A, Australopithecus; E, Equus caballus; H, Homo habilis; P, H. erectus; S, Homo sapiens. Parallel lines on "probability" paper with logarithmic abscissa imply equal coefficients of variation, in this instance about 10%. (From Jeris
. Advances in the study of mammalian behavior. Mammals. Structure, Development, and Function 139. 25 30 35 200 Copacily or Brain Weight (ml or g) 1000 1500 2000 Fig. 13. Cumulative frequency distributions of brain size, with corresponding normal curves (top). Abbreviations are: B, Bathygenys reevesi (an Oligocene ore- odont); F, felis catus; C, chimpanzee; A, Australopithecus; E, Equus caballus; H, Homo habilis; P, H. erectus; S, Homo sapiens. Parallel lines on "probability" paper with logarithmic abscissa imply equal coefficients of variation, in this instance about 10%. (From Jerison, 1979a.) uous model, which would permit one to make inferences about the rate and pattern of evolution of brain size, and a discrete model that assumes stasis at each of several grades and rapid evolution between grades. The continuous model is heuristic, permitting sophisticated mathematical development. Witness Lande's (1979) work that led to an alternate approach to the appearance of allometric exponents less than % (see the discussion here of cetacean encephalization), and his success in distinguishing short-term from long-term differ- entiation of brain-body evolution. He could describe short-term dif- ferentiation as reflecting primarily selection for body size, and long- term differentiation as allowing for independent evolution of 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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