A, B. Example of different time courses in position and velocity between the left eye (solid lines) and the right eye (dotted lines), obtained from a single trial in which the saccadic target was on the right side. Positive deflections shown on the vertical axis of A, B and C denote rightward movements, and thus indicate the eye movement toward the target. C. Version velocity, i.e., the averaged velocity between the eyes. The saccade initiation, peak-velocity and end of the trial are indicated by arrowheads, based on the version velocity. Horizontal axis is taken from the onset of the arrowhead cue image (see Fig. 1).