text: In the article it explains how this system works. I will be wrtiting about how it works and get examples from the article. In the article it says that an action unit can calculate movement of one or more msucles and can detect the emotion. Dr. Paul, the creater of FACS states that he has calssified 6 different emotions which are happiness, surprise, anger, disgust, fear, and sadness all with the FACS. Examples of how the FACS can detect your emotion is in your face movements for example, as said in the story when your frontalis pars lateralis muscle raises your eyebrow when you are surprised; your orbicularis oris tightens your lips when you are angry. It is fantastic how this can know the emotion you are feeling.