Listening means getting the air into the body and the mind, which we call breath. We use three kinds of breath. We use the all breathes and it is always mixed like the harmony of sounds or colors. Basic breath is from the bottom of our body. Middle breath is from chest. The last is from the head. Never from the throat!! Do actors have interaction with their own breathes? Changing mind means changing breath.
Sound amplifies actors. Sound helps actors change their breath. Like the sudden alarm drives our body stiff, sound go inside.