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Well, I disagree with the notion that the human nervous system is simply interconnected boxes in which a particular stimulus brings about a particular response.  I say this because a group of people in the same room with the same set of stimuli display various types of responses, or don't respond at all.   Perhaps the best way to describe the human nervous system is to describe it as interconnected boxes within boxes because at least this explanation reflects the complexity of the causes of our actions.  It's not clear to me still how a box can produce output with no input, and vice versa.  Maybe it is this very phenomenon that makes each person unique in behavior since the same input for a group of people may not necessarily produce an output in all of them.