sleuthiness
jump
- Joined
- Jul 3, 2008
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It has a lot to do with control of the vocal cords. Imagine a balloon filled with air, but you're pinching it closed. If you just open end a very little bit, it generates a huge amount of noise with very little air passing through. If you open it more, such that the air passes more freely, the sounds gets quieter. Quiet people tend to have more "breathy" voices and use more air to speak.
Another factor is frequency. Higher frequencies are usually more audible than lower ones. E.g., raising pitch can often make one more easily heard than raising volume, especially if one is in a loud environment.
Interesting points.
Metaphor, though I think you mean indoor/outdoor, inside/outside as pertaining to percentage of physical expressiveness v. internal thought speech could also be a valid explanation, one I'd also personally vouch for.