Eye Gaze Position Research Articles

The Influence of Lateral Orientation on Cerebral Processing

An investigation was undertaken to determine if the lateral placement of a visual stimulus, and the observer's consequential eye-gaze position while orienting towards the stimulus, affects the observer's response to the stimulus. It was predicted that a lateral positioning of the eye-gaze would facilitate cerebral processing in the hemisphere contralateral to the direction of the eye-gaze. Because each hemisphere is generally specialized for certain types of processing, it was theorized that responses to “verbal” problems would be augmented when placed 200 to the right of center as opposed to 20° to the left of center; and that responses to “spatial” problems would be aided when the stimuli were located 20° to the left of center as opposed to 20° to the right of center. Twenty-four right-harided male and female adults served as subjects. Verbal problems consisted of a comparison of capital and noncapital letters. Spatial stimuli consisted of dot-and-square diagrams. In toto, the results of the performance tests are in partial support of the theory .

Unconstrained Pupil Detection TechniqueUsing Two Light Sources And The ImageDifference Method

For developing a human-computer interface applying eye-gaze, we have already proposed a noncontact, unconstrained video-based pupil detection technique using two light sources and the image difference method. The detected pupil position in the difference image is utilized together with the glint (corneal reflection light of an infrared light source) position for eyegaze position determination. In this paper, the hardware for real-time image differentiation was developed. This image differenciator made realtime pupil possible, by applying the pupil detector including the noise reducer, which had been already developed. For stably detecting the glint and the pupil, it was clarified that the pupil brightness is influenced by the pupil area and the power of infrared light irradiated for the eye. For stabilizing the pupil brightness in the difference images, a method which utilized this characteristics was proposed. This method made pupil and glint center detection stabler.