When tracking a target, gain (eye velocity/target velocity) may be abnormal:
-When the gain is low, catchup saccades are seen, giving the appearance of saccadic pursuit.
-Conversely, when the gain is high, backup saccades are observed¹.
 

(vv)Abnormal Saccadic Pursuit.mp4(tt)

From: Abnormal Saccadic Pursuit. From: https://www.youtube.com/watch?v=UEqraYeP7Qs

Patient with past history of left MCA stroke. Smooth pursuit and VOR suppression are saccadic to the left (ipsilesional) and normal to the right.

(vv)SaccadicSPVORSupp.mp4(tt)

From: Gold D. Saccadic smooth pursuit and vestibulo-ocular reflex suppression (VORS). Neuro-Ophthalmology Virtual Education Library: NOVEL Web Sit]. 2016. Available at: https://collections.lib.utah.edu/ark:/87278/s6j70rkm

See also:VOR suppression
 

(vv)abnormalSPflocculus.mp4(tt)

From: Struppp M. Clinical Examination of the Ocular Motor and Cerebellar Ocular Motor System. J Vestib Res. Teaching Course, 29th Bárány Society Meeting, Lecture 2, June 5, 2016, Seoul, Korea.From: https://www.youtube.com/watch?v=meXAjVoQdCI