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Smiling also inhibits the gag reflex, notice that when you grimace at a bad smell you're flexing most of the same muscles.
If you deprive yourself of external stimuli by putting something opaque that lets some light through over your eyes (halves of ping pong balls work,) plug heaphones into a radio set to static or a white noise generator, and lie still with your eyes open for a while, your brain will respond by making some stimuli and you'll start hallucinating.
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