For example, how do our ears easily discern that someone talking in a room is actually there vs the dialogue coming from a television is not physically there?
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Missing overtones. Every note you play (or sing) has a number of higher notes that ring along. If you listen carefully when plucking a guitar string you can even hear some! It‘s the same with other sounds (just not as musical and clean). When a recording is made you will always cut off some overtones for technical reasons, making the voice more flat. This is also why we are kinda bad at telling apart people on the phone, those overtones carry a lot of the uniqueness of our voice. But even with a perfect recording equipment, the environment of the person speaking is different than your own, if you‘re wearing headphones the voice doesn‘t interact with your own environment the way it‘s supposed to, speakers aren‘t on the same height as a mouth and other things like that
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