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Published online by Cambridge University Press: 30 October 2001
Constraint has played a major role in brain evolution, but cannottell the whole story. In primates, adaptive specialization issuggested by the existence of a covarying visual system, and mayexplain some residual variation in the constraint model. Adaptationmay also appear at the microstructural level and in the globallyintegrated system of brain, body, life history and behavior.