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After reading Michelle and Emily's comments about outputs with no physical stimuli and interneurons, a few things started to click.  During class we used Autism and seizure disorders as examples of outputs without inputs.  By creating outputs without inputs, it makes sense that seizures and autistic characteristics come from confusion within the interneurons, almost as if there was a traffic jam or a glitch in the system.  Further, if 99.99999% of our neurons are interneurons, it would explain how easy it would be for these problems to occur (with so many interneurons for them to occur at)  and therefore validate how prevalent these disorders are in society.  

As far as interneurons go, it seems to make sense to me why we would need 99.9999% of our neurons to be interneurons.  I can't even begin to imagine the complexity of regulating the entire human body.  From helping the body talk to itself about regulating temperature, blood pressure, breathing and heart rate, the demand on interneurons seems infinite.  If the job of these interneurons is to communicate with each other to achieve homeostasis, then I can justify how our communication with the external world demands only 0.000001% of our neurons.