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The discussion on the idea that the nervous system can create motor symphonies without the use of reafferent loops or external stimuli got me thinking about some of the little everyday movements of different people. Many people seem to be constantly making small, unconscious movements for no particular reason. Very few people every actually stay still. For example, I know a guy whose legs are always moving. Whenever he is sitting or laying down he unconsciously starts jiggling his legs. No external stimuli cause this behavior, and usually he doesn't even realize he's doing it until someone brings it up. Also, whenever I'm sitting I start wiggling my toes. These movements seem to serve no purpose and occur without thinking. Perhaps these are examples of a combination of pre-existing motor scores that the nervous system contains and specific neurons that are continuously permeable to some degree to sodium ions.