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I'm interested in your second point, but from a little larger view.  You mention how do your signals react from an interruption of the book affecting your thoughts.  What I kind of want to learn more about is how does your body decide/organize what it will react to when you walk into an area full of many stimuli, for instance a carnival or a mall.  Does your mind sort through instantly the many excitatory signals that arise from the many inputs because of previous preconditioning???  It seems weird for the mind to be able to work that quickly to interpret so many inputs and allow you to focus on the one thing.