Eye tracking is a process that identifies a specific point in
both space and time that is being looked at by the observer.
This information can also be used in real-time to control
applications using the eyes. Recent innovations in the video
game industry include alternative input modalities to provide an
enhanced, more immersive user experience. In particular, eye
gaze control has recently been explored as an input modality in
video games. This book is an introduction for those interested
in using eye tracking to control or analyze video games and
virtual environments. Key concepts are illustrated through three
case studies in which gaze control and voice recognition have
been used in combination to control virtual characters and
applications. The lessons learned in the case studies are
presented and issues relating to incorporating eye tracking in
interactive applications are discussed. The reader will be given
an introduction to human visual attention, eye movements and eye
tracking technologies. Previous