Noun
English Wikipedia has an article on:encephalizationWikipedia
encephalization (plural encephalizations)
(biology) The amount of brain mass exceeding that related to an animal's total bodymass.
At the neural tube stage, the anterior portion undergoes encephalization to generate or 'pattern' the basic form of the brain. Source: Internet
The size of their brain relative to their body is much less than that of mammals, the encephalization quotient being about one tenth of that of mammals, citation though larger reptiles can show more complex brain development. Source: Internet