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In class we discussed how inputs entering the brain did not necessarily lead to an output, and vice versa.  I find this to make slightly more sense than the model that suggested that stimuli eventually lead to a response.  However, I have trouble grasping the concept that an output may come from a random "box" in the brain.  The experiment with the leech confused me greatly. How could the nervous system have a reaction to nothing?  Maybe when the input led to no output, it actually saved the stimulus so that a reaction could come at a time where there was no input entering the nervous system.