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Increase in the ratio of brain mass to body mass during the evolution of a species or other taxonomic group. Higher degrees of encephalization are generally correlated with higher degrees of intelligence.

en·ceph′a·lize v.
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References in periodicals archive ?
Importantly, these societal and cultural characteristics are linked with brain size and brain expansion also known as encephalisation, the researchers said, in the paper published in the journal Nature Ecology and Evolution.