text: In the article it says "The process begins when the computer constructs a 3-D computer model of the face; all 44 major muscles in the model must move like human muscles. Movement of one or more muscles is call and "action unit." In that paragraph its technically talking about how the computer will recognize facial expressions but in my opinion I feel like that would take alot of work for computer technicians to actually put more devices in a computer just to see what people think about them.