Evolutionary rates for brain proportion at birth and for absolute adult brain size have a negative borderline significant correlation, such that species that tend to show high rates to increase their absolute adult brain size also tend to show high rates to decrease their brain proportion at birth ( r = −0.117, P = 0.051; Fig. 3a ), which is not surprising because brain proportion values also reflect changes in adult brain size.
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The evolution of human altriciality and brain development in comparative context.
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