Eye movement measurements (BBM)/ Eye-tracking (ET)
(The video presents the text in German Sign Language)
In eye movement measurements (or eye-tracking), the subject's eye movements are recorded. This is done by means of an infrared camera that fixes the pupils and tracks their movements. The distance between the camera and the pupils then determines the fixation points on the screen that the test subject looks at during the experiment. For example, this allows us to track where exactly the subject's attention is while watching a sign language video and how the subject visually interacts with the presented stimuli. By determining where, when, and for how long eye movements occur, we can draw conclusions about cognitive processing.
To obtain accurate measurements, it is necessary to set up the equipment individually for each subject before the experiments begin. During the survey, the subject places his head on a support to avoid additional movements and resulting measurement errors.