Figure 4.

Relationship between postsaccadic eye velocity and the distance from the endpoint of the saccade to the target position when the first saccade is aimed at a stationary target. A, Schematic diagram showing the task as a sequence of four snapshots in time. A1, A target (open circle) appears stationary but offset from the current position of the eye (x). A2, The target steps and moves to the right at 20°/s. A3, A saccade is made to the old location of the target, and the eyes begin to move smoothly along the direction of target motion. A4, The eye saccades to the new location of the target and tracks it appropriately. B, Plot of postsaccadic eye velocity in the direction of new motion as a function the distance between target and eye at the end of the saccade for one monkey. Dots show data for individual trials, and larger symbols show means for the three different amplitudes of displacement of target position. Positive and negative values of postsaccadic eye velocity were taken from trials in which the new target motion was rightward or leftward. C, Means and SDs of the absolute value of postsaccadic eye velocity in the direction of new motion for all monkeys used in each experiment. Different symbols correspond to different monkeys.