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13 Primate Intelligence

  • Richard W. Byrne
Reference work entry

Abstract

Brain size has traditionally been employed as a measurable proxy for species intelligence. Using allometric scaling of brain size relative to body size shows the biological cost suffered from investment in brain tissue. Shifts in diet type are the engine permitting increased investment in brain tissue because higher energy diets allow a larger brain at any given body size. Relative brain size, however, confounds effects of gut size required for particular diets with effects of brain size required for enhanced cognitive function. In contrast, the absolute size of brain parts specialized for particular functions gives evidence of the computational power of those systems. Correlational analyses strongly imply that demands of social complexity, rather than difficulties associated with frugivory or embedded foods, led to evolutionary increase in simian primate brain size. Primate brain expansion has largely involved neocortex, and among living primates, neocortex size predicts frequency of use of tactical deception and of innovative responses. These capacities likely rely on extensive memory for social information, but there is evidence (only) among great apes for understanding how systems work, whether social or technical. Representational understanding may derive from the ability to parse complex behavior, allowing imitative learning of elaborate new skills.

Keywords

Body Size Brain Size Allometric Scaling Human Intelligence Large Brain 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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  • Richard W. Byrne

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