Figure 7. Representative record of vertical saccades made by P1.

The left axis displays eye and target position and the right axis displays eye velocity. Target position is indicated by the dotted line. The first, downward saccade (S1) is mildly disjunctive (right eye, red trace, moves farther), although peak velocities of the two eyes are similar. Subsequently, the left eye (blue trace) drifts away from the target (D1). The second, upward saccade (S2), which has a small overshoot, starts with the eyes at different positions, but the change in eye position is similar and the velocity profiles are very conjugate (overlapping records).