Gaze-based interaction enables users to communicate with a system via eye movements. To select a target or to enter text, current approaches usually apply a so called “dwell-time”. Thereby, participants need to fixate an item or a letter for a certain period to select it. According to recent studies, experienced users are able to work sufficiently well with dwell-times of only 300 milliseconds. However, errors still occur and reduce the overall interaction accuracy.
Pupil diameter serves as an indicator of our bodily arousal. An increase in physiologic activation is usually accompanied by an enlargement of pupil size. The current project aims to improve dwell-time based interaction by applying pupil diameter as a mechanism for real-time error monitoring. Assuming false-positive input to briefly increase physiologic arousal (and enlarge diameter), we should be able to adjust incorrect entries automatically and further improve interaction accuracy.
The project promises insights into the methods of eye-tracking and pupillometry. In addition, basics of empirical designs are provided. |
