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its just your brain increasing its sensitivity to noises. it could almost be considered a noise floor, or possibly the blood vessels in your ear. as red blood cells pass through the capillaries, they bump the walls a bit, causing minuscule vibrations to the eardrum.

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โˆ™ 2009-06-17 01:38:51
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Q: What is the high pitched humming sound often heard in an otherwise empty and silent room?
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