That would depend on the amount of movement of the head. The brain is suspended in fluid so it is in almost constant movement. Generally about a quarter inch.
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6.7 millimeters
http://www.hal.inserm.fr/docs/00/58/91/8…
http://www.sciencedaily.com/releases/200…
http://answers.yahoo.com/question/index?…
http://www.hal.inserm.fr/docs/00/58/91/8…
http://www.sciencedaily.com/releases/200…
http://answers.yahoo.com/question/index?…
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Depends on whom it is... I had a boss that had more space than brain in his skull...
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About 18 inches