Gaze-Assisted Pointing for Wall-Sized Displays

Abstract

Abstract. Previous studies have argued for the use of gaze-assisted pointing techniques (MAGIC) in improving human-computer interaction. Here, we present experimental findings that were drawn from human performance of two tasks on a wall-sized display. Our results show that a crude adoption of MAGIC across a range of complex tasks does not increase pointing performance. More importantly, a detailed analysis of user behavior revealed several issues that were previously ignored (such as, interference of corrective saccades, increased decision time due to variability of precision, errors due to eye-hand asynchrony, and interference with search behavior) which should influence the development of gaze-assisted technology.

Eye and pointer coordination in search and selection tasks

“…Several techniques have been developed to facilitate pointing tasks by decreasing their difficulty along the lines of Fitts' Law [Balakrishnan 2003]. For instance, techniques exploit eye-tracking technology to move the pointer to the location of a detected eye fixation on the computer screen [Zhai, et al 1999;Bieg et al 2009;Drewes and Schmidt 2009] or to select one of several pointers near the fixation point [Raiha and Spakov 2009;Blanch and Ortega 2009], thereby reducing the amplitude and thus also the difficulty of the pointing movement. The underlying assumption is that the item of interest is fixated before it is acquired and that turn-taking occurs between eye and pointer movement to maximize movement time savings.…”