Figure 3

Various types of smooth pursuit tracking to a target (dotted line). From left top, the subject's tracking, shown by the solid line, has deviant smooth pursuit (sp with one arrow), which is corrected by a catchup saccade (cs). Tracking is normal (sp with three arrows), but then an anticipatory or leading saccade (as) causes it to deviate. Smooth pursuit (sp with two arrows) is then slowed so that the target can catch up to eye position. (From ref. 89)

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published 2000