ABSTRACT
People use their eyes mainly for observation, but people also use gaze to enhance communication; for example, staring at somebody soon causes a reaction: “What? Do you want something?” Similarly, an intense look at a water jug may be enough to motivate someone at a dinner party to pour more water for you. us the direction of a person’s gaze not only allows observation by that person of the world around them, but also reveals and communicates their focus of visual attention to the wider world (Just and Carpenter, 1976). It is this ability to observe the visual attention of a person, by human or machine, that allows eye gaze tracking for communication.
