1. Crick F. The astonishing hypothesis: the scientific search for the soul. New York: Charles Scribner’s Sons; 1994.
2. Dorland’s Illustrated Medical Dictionary. 27th ed. Philadelphia, PA: W.B. Saunders Co. (Harcourt Brace Jovanovich Inc.); 1988.
3. The American Heritage Dictionary of the English Language. 4th ed. Boston, MA: Houghton Mifflin Co.; 2000.
4. Neisser U. Cognitive psychology. New York: Appleton; 1967.
5. Damasio H, Grabowski T, Frank R, Galaburda AM, Damasio AR. The return of Phineas Gage: clues about the brain from the skull of a famous patient. Science. 1994;264:1102–5.