![]() ![]() In response to staircase stimuli, I decreased concomitantly with an increase in D with pulse-step stimuli, as D increased, I decreased slightly in three subjects and decreased markedly in two subjects. With both staircase and pulse-step stimuli, the eye saccade preceded the head movement, and the gaze response either had the stimulus profile pattern or consisted of one gaze saccade to the final target offset. The measured variables were head and gaze offset, the interval between two consecutive saccades from onset to onset (I) and the response delay between onset of the second step and onset of the first gaze saccade (D). We have tested this hypothesis in five healthy subjects. That is, the eyes and head should aim at each target displacement so that their combined movement matches target offset. On this basis, when the visual stimulus consists of two successive steps in the same (horizontal) direction, either increasing in eccentricity (staircase) or decreasing in eccentricity (pulse-step) gaze should be due to concomitant eye and head angular displacement. Tight coupling between eye and head movements has been observed in response to a single visual target offset. ![]()
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