text: A classroom computer could recognize when a student is becoming confused or bored, Dr. Huang predicts. Then it could modify the lesson, like an effective human instructor. The same technology can make computer-animated faces more expressivefor video games or video surgery. Most human communication is nonverbal, including emotional communication, notes Dr. Huang. So computers need to understand that, too.Eckman has classified six basic emotionshappiness, surprise, anger, disgust, fear, and sadnessand then associated each with characteristic movements of the facial muscles. For example, your frontalis pars lateralis muscle (above your eyes) raises your eyebrows when youre surprised; your orbicularis oris (around your mouth) tightens your lips to show anger.