Dr Jeroen Smaers (UCL Anthropology and UCL Genetics, Evolution & Environment), lead author of the study said: "The brain is central to how animals adapt and modify their behaviour in a changing environment. "What we've found is that in relation to the brain, species differences are mainly explained by how the brain is organized and wired internally, not how large the brain is. This suggests that brain reorganization, not size, may have been the principal force driving brain evolution."
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