hot water and urinating

[jwtaylor]

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i was just watching MASH (greatest show ever in my opinion) and i was reminded of something i was always curious about and neurology should be able to explain it. it's when you take someones hand or fingers or whatever and put them in cold or hot water (ive heard both) while they are sleeping and it supposedly makes them pee themselves....ive never done it so i dont even know if it works, if it does work, whats going on behind the neurological scenes?