Abstract: The main reason that eye-movement based user interfaces are attractive is that the gaze direction of eyes can express the interests of the user – it is a potential window of cognitive processes – and communication through the gaze direction of the eyes is faster than any other modes of human communication. In this study, a 2arrangement×6target position within subject factorial design was used to compare different arrangements of interactive objects for an eye-movement based interface suitable for the general GUI environments such as Microsoft Windows. We found that: (1) In eye-movement based human computer interaction, the selective efficiency was higher for horizontal arrangements than for vertical arrangements. (2) The arrangement of objects affected the effect of target position on task time. When the objects were arranged horizontally, with the target moving right, task time increased linearly, but when the objects were arranged vertically, with the target moving down, task time increased nonlinearly. (3) Target position only affected the time of target location in both arrangements. In addition, the time of target activation was not affected by the arrangement of objects and the target location. Therefore, objects should be arranged horizontally in interactive systems based on eye tracking technology

Key words: Eye gaze interface, eye tracking device, Time of Target Localization (TTL), Time of Target Activation (TTA)