If the extrovert is trying to "cheer up" the introvert - extroverts are programmed to seek social rewards! - he or she may feel like a failure if the introvert remains unmoved.

Though introverts are drained by interaction, we can take immense pleasure in watching the scene around us.

Introverts are collectors of thoughts, and solitude is where the collection is curated and rearranged to make sense of the present and future.

If the extrovert watches and listens a bit more, the introvert's true mood will become more evident.

Extroverts are more attuned to social rewards, so they are more likely to flash a smile for effect. A notable exception are introverts - like me - whom I call "socially accessible" introverts. We have been trained well to smile and nod, which can place a burden on our processing efforts.

Introverts often assume what's inside is visible on the outside. We don't have to invent or fake the emotion; we just need to allow it to be seen!

An extrovert is more likely to share immediate reactions and process information through conversation.