Under normal circumstances you hear things both internally and externally and our brains combine them to a “normal” volume. When you have headphones in, you only hear the internal sound which even though it’s going through your skull it’s amplified. Talking gets muted because the sound is projected outwards and isn’t contained by our mouth.
It’s why our voice sounds different when we hear a recording as opposed to what we ourselves hear.
I tried to make it super simple lol.
Your jaw bones help conduct sound to your ears, this is why your voice sounds different to you than it does to other people. The earplugs enhance this conduction by filling empty space, thus amplify the sound. When Beethoven was losing his hearing, he would, now famously, bite his piano to take advantage of this property of hearing.
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