Before revision: Established eye movement and pupillary response indicators of cognitive load are: pupillary diameter mean pupillary diameter deviation number of gaze fixations > 500 millisecondssaccade speed pupillary hippus There is active research interest in using physiological responses to indirectly estimate cognitive load, particularly by monitoring pupil diameter, eye gaze, respiratory rate, heart rate, or other factors .
After revision: There is active research interest in using physiological responses to indirectly estimate cognitive load, particularly by monitoring pupil diameter, eye gaze, respiratory rate, heart rate, or other factors .