text: Your Fellow StudentsEmotions can reveal a lot about what is going through someone's mind. When a person is wearing a neutral face on, it is hard to tell what emotion they are feeling. Now there is technology to help decipher what that perosn is feeling. Dr. Paul Eckman has created a process when a computer contructs a 3-D computer model of the face to tell what emotion is on it, Facial Action Coding System or FACS.