There have been very few studies of brain size and encephalization in cetaceans and essentially none that have made direct quantitative comparisons of cetaceans and another mammalian group using large normative samples. In the present study two different measures of encephalization were calculated and used to rank and compare 21 odontocete species and 60 anthropoid primate species. Comparisons were made both within and between the two groups. Results show that the encephalization level of Homo sapiens is still extraordinary relative to that of nonhuman species. Nevertheless, a subset of delphinid odontocetes are significantly more highly encephalized than the most highly encephalized anthropoid primates and narrow the gap in encephalization between humans and nonhumans substantially. These findings may have implications for comparative models of the relative importance of brain size versus brain organization for the evolution of intelligence.
Lori Marino, PhD
Department of Biology, Emory University
Atlanta, GA 30322 (USA)
Tel. (404) 727-7582, Fax (404) 727-2880
Number of Print Pages : 9
Number of Figures : 4, Number of Tables : 2, Number of References : 58
Brain, Behavior and Evolution
Founded 1968 and continued 1968–1986 by W. Riss, New York, N.Y.
Official Organ of the J.B. Johnston Club
Vol. 51, No. 4, Year 1998 (Cover Date: April 1998)
Journal Editor: R. Glenn Northcutt, La Jolla, Calif.
ISSN: 0006–8977 (print), 1421–9743 (Online)
For additional information: http://www.karger.com/journals/bbe
Article / Publication Details
Published online: 3/6/1998
Issue release date: April 1998
Number of Print Pages: 9
Number of Figures: 4
Number of Tables: 2
ISSN: 0006-8977 (Print)
eISSN: 1421-9743 (Online)
For additional information: http://www.karger.com/BBE
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