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From encephalize +‎ -ation.

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encephalization (plural encephalizations)

  1. (biology) the amount of brain mass exceeding that related to an animal's total body mass.
    • 1998 June 12, Dean Falk, “PALEONTOLOGY: Hominid Brain Evolution: Looks Can Be Deceiving”, in Science[1], volume 280, number 5370, DOI:10.1126/science.280.5370.1714:
      The answer to this will determine the encephalization quotients of the two types of early hominids ( 8 ), which is an important indicator of relative "braininess," an issue that is now up for grabs.
    • 1999 January 15, Matt Sponheimer & Julia A. Lee-Thorp, “Isotopic Evidence for the Diet of an Early Hominid, Australopithecus africanus”, in Science[2], volume 283, number 5400, DOI:10.1126/science.283.5400.368, pages 368-370:
      It is believed that the encephalization of early Homo was made possible by the consumption of energy- and nutrient-rich animal foods to "pay" for its metabolically expensive brain (39, 40 ).
    • 2001 November 2, Jerome M. Siegel, “The REM Sleep-Memory Consolidation Hypothesis”, in Science[3], volume 294, number 5544, DOI:10.1126/science.1063049, pages 1058-1063:
      The time spent in REM sleep is not correlated with learning ability across humans, nor is there a positive relation between REM sleep time or intensity and encephalization across species.

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