Reading: Definition: Facial feedback, we believe that our emotion causes our facial expression. But it is not true. It is our facial expression determines how we feel. Listening: The professor gives an example of an experiment. He gives out the same math problem to two groups of students. Everything is the same except one. He asks students in Group A to smile in the experiment, and asks students in Group B to present frown and other unhappy faces in the experiment. As a result, students in group A say they enjoy the math, while students in group B say they are tortured.