There is no relation whatever between brain size and intelligence. One of the smallest was that of the gifted French writer Anatole France (1,100 grams); the largest on record was that of an idiot (2,850 grams). (Montague, Ashley. The Natural Superiority of Women. p 62-63. NY: Collier Books, a division of Macmillan Publishing Co., Inc., 1952, 1974.)

General intelligence is closely linked to the amount of gray matter in the frontal lobes, and has more to do with the number of brain cells in the frontal lobes than with the density of fibers connecting them. To some degree, intelligence is plastic and modifiable. (Restak, Richard, MD. The New Brain. p 30-34. PA: Rodale, 2003.)

fMRI studies by Dutch scientists: the most efficiently wired brains tend to belong to the most intelligent people. Their brains don't have more connections, but they have more efficiently placed connections. It’s like taking a direct airplane flight versus one with two or more stop-overs. (Callaway, Ewen. Speeding up brain networks might boost IQNew Scientist Life, 2009.)

Gray matter, located in a quarter-inch layer at the surface of the brain, is basically responsible for intelligence. Blood flows faster through gray matter than through any other brain tissue. Women and left-handers (male or female) have more gray matter than men who are right-handed. Gray matter processes information locally in the brain. (Stump, Jane Barr, PhD. What’s the Difference? How Men and Women Compare. p 86-87. NY: William Morrow and Company, Inc., 1985.)

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