text: Action Coding System enables computers to identify human emotions. This is very vaulabe and could be great for classrooms. For example, if you smile when a web ad appears on your screen,a similar ad might follow. But if you frown, the next ad will be diffrent "A classroom computer could recognize when a student is becoming confused or bored," Dr. Huang predicts. "then it could be used to modify the lesson, like an affective human constructor."