Chimps spend most of their time in the jungle, but baboons usually live in the open savannah, just like the ancestors of humans. The average brain weight for baboon was found to be 0.8384% of the body weight, where as the average brain weight for was 3.0769 of the body weight. In primates, brain size seems to be related to group size. To analyze characteristics of baboon brain tissue volumes during adulthood independent of individual differences in brain size, absolute brain volumes were corrected for TIV, resulting in individual proportions of GM, WM, and CSF in relation to individual TIV. Size. The mean length (O-F) and width (P-P) of human brain were found to be in the ratio of 1.3077, where as for baboon brain this ratio was 1.25. The baboon’s large brain size makes them more suitable for magnetic resonance imaging (MRI) and positron emission tomography (PET) studies, increasing its potential as a possible model for functional imaging studies of ischemia and neurological disorders—e.g. Although it has a brain the size of a baboon’s, the latter’s boasts a high degree of folding whereas a manatee’s is almost entirely smooth. These baboon-size animals are the world's most terrestrial primates—except for humans. The relationship between brain size and body size continues to tempt and vex attempts to identify the role of cognition in primate evolution. For their body size, baboons have larger brains even than our close relatives, the chimpanzees. D. Tab Rasmussen, M. Kay Izard, Scaling of growth and life history traits relative to body size, brain size, and metabolic rate in Lorises and Galagos (Lorisidae, primates), American Journal of Physical Anthropology, 10.1002/ajpa.1330750307, 75, 3, (357-367), (2005). The results further indicate that variation in brain size does not clearly correlate with such a basic ability as size discrimination. The researchers analyzed the brain sizes … Fractional GM, WM, and CSF volumes did not differ between genders (Table 1). Primate brains may have grown larger and more complex thanks to a fruit-filled diet, a new study suggests.. Their brain size may underly their intelligence as primates have relatively large brains in relation to their body size. Due to their size and the fact that Baboons spend the majority of their lives on the ground, they are preyed upon by numerous predators throughout their natural range. Baboons and macaques, having relatively smaller brains than bonobos and chimpanzees (Jerison 1973), performed just as well as the apes. Baboons are the world's largest monkeys, according to National Geographic.From head to bottom, baboons grow to 20 to 34 inches (60 to 86 …

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