The phenomenon of hearing your own voice amplified through bone conduction or in a distorted way, or the ability to produce one's own sound.
From Greek 'auto-' (self) and 'phone' (sound). Medical literature adopted this term in the 20th century to describe hearing phenomena related to one's own vocal production.
Swimmers experience autophony underwater—your voice sounds completely different because sound travels differently through water, which is why your singing in the shower sounds so much better than it actually is!
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