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The use of the words brain mind and attention are all somewhat problematic for think. Mind is certainly the most common of these three nouns, but it sets up a circular definition where mind is the part of you that thinks and think means use your mind. Brain is the least common of these. I chose attention because it is within the top 1000 words (though much less common than think) and entails using your brain.--Brett 18:42, 28 August 2007 (UTC)