encephalization

listen to the pronunciation of encephalization
Английский Язык - Английский Язык
the amount of brain mass exceeding that related to an animal's total body mass
Encephalization is defined as the amount of brain mass exceeding that related to an animal's total body mass. Quantifying an animal's encephalization has been argued to be directly related to that animal's level of intelligence. In fact, as early as 1871, Charles Darwin wrote in his book The Descent of Man: "No one, I presume, doubts that the large proportion which the size of man's brain bears to his body, compared to the same proportion in the gorilla or orang, is closely connected with his mental powers."
(Hayvan Bilim, Zooloji) Zoology - An evolutionary increase in the complexity or relative size of the brain