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Webster 1913 Edition

Noun.

Action of the brain, whether conscious or unconscious.

cerebration ‎(countable and uncountable, plural cerebrations)

The act of cerebrating; thinking, mental activity.
- 1902, William James, The Varieties of Religious Experience, Folio Society 2008, p. 177:
  Dr Carpenter first, unless I am mistaken, introduced the term ‘unconscious cerebration’, which has since then been a popular phrase of explanation.
- 2009 January 25, Lee Siegel, “No Exit”, in New York Times:
  Duncan himself, however, seems to have alpine cerebrations embedded in his very molecules.