I'm not a professional actor so I'm sticking my neck out on this. I hope the pros will let me know if I don't know what I'm talking about. OK, here goes....Good live action acting is good reading. Acting is not a branch of psychology or dance, it's a type of music. That's why the most important part of rehearsal is the reading. The actors and the director sit around a table, scripts infront of them, and try to find the rhthym of the dialogue. They're like a jazz combo trying to figure out how they all fit together. Some may come out of the reading with a larger role to play and some will come out with a smaller role to play. Sometimes an extra line or an extra character will be mandated. It's all part of the quest to find the overall "sound."
When I use the word "reading" I'm not only referring to what happens around the table but also to the literal act of reading itself. Good acting is frequently rhetorical and oratorical, even when it's fairly intimate. Thinking about acting as a sort of heightend speech from a podium prevents an actor from getting too precious and emotionally self-indulgent about a line. It reminds him that his main asset is the quality and control of the voice itself. A good actor knows that how you say something is often even more important than what you say.
