Fig. 6. Electro-oculography of unilateral saccadic (cogwheel) pursuit in a patient with left cerebral hemispherectomy. The upper two tracings represent position and velocity, respectively, from the right eye; the lower two tracings are from the left eye. Upward deflection represents rightward eye movement. The pursuit movement to the right (upslope) is smooth, with only occasional interspersed saccades, while pursuit toward the left (downslope) is slower than the target and requires catch-up saccades to regain target foveation. The multiple saccades are particularly evident in the velocity tracings.