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As well as physical hearing loss - with usually the high frequencies going first, the brain slowly loses the ability to process complex sounds, so the ability to discern voices in a crowded room is reduced.
This is one reason why some people complain about not being able to hear dialogue on some movies very well.
Sensitivity to high frequencies can also be an early sign of tinitus. This is not always a ringing in the ears but can be sensitivity to specific frequency ranges, or a continuous tone or drone when the environment is very quiet. |
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