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Studying the nervous system at the cellular level does provide some insight into human behavior.  Yet I cannot help but feel that this perspective is incomplete.  Analyzing the various types of action potentials is going more in depth into the output of the nervous system.  How about the input?  We mentioned before that not all output boxes are connected to input boxes.  Does that mean action potentials can be generated  without stimuli?  Even by linking the action potentials to our behavior, are we implying that our outward behavior is a sum of action potentials?