Contrary to what we tend to assume, the normal state of the mind is chaos. Without training, and without an object in the external world that demands attention, people are unable to focus their thoughts for more than a few minutes at a time. It is relatively easy to concentrate when attention is structured by outside stimuli, such as when a movie is playing on the screen, or when while driving heavy traffic is encountered on the road. If one is reading an exciting book, the same thing occurs, but most readers still begin to lose concentration after a few pages, and their minds wander away from
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