Communicating by expression

Vocal emotion is usually accompanied by reinforcing expressions. These are actually quite difficult to hide, and micro-expressions are quite famous for revealing secrets. These expressions aren't all universal, but those that are can add a layer of depth to your communication. Many of these expressions, of course, are culturally transmitted, and so need to be learned. You can see this in the expression mimicry (as well as the emotive delivery mimicry) of mass media entertainment in your own lifetime.