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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.
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.
As it has been usually enhanced by biologists and ethologists up to-day, there are two sets of factors, environment and sociality that are inextricably linked in the causation of hominid encephalisation and human intelligence, up to the point -according with Cartwright (2008)- that some recent work has tested the competing claims of two theories (social complexity and theory of mind) as implying and suggesting that social relationships and their correlative representational and symbolization productions may have been crucially important to explain both ecological and ethological evolution.
Irrespective of the driving force for encephalisation, two critical requirements had to be met: (i) the brain's chemical requirement for long-chain polyunsaturated fatty acid (PUFA), particularly arachidonic acid (20:4n-6) and docosahexaenoic acid (22:6n-3), both of which can only be obtained from animal tissue; (22,23) and (ii) the increased metabolic requirements of a larger brain.