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A moving visual stimulus creates both retinal position and velocity errors, often resulting in a combination of saccadic and pursuit eye movements (Dodge, 1903). Early studies designed to characterize these eye movements identified position error as the fundamental stimulus for saccades and velocity error as the fundamental stimulus for pursuit (e.g. Rashbass, 1961, Lisberger, et al, 1987). However, more recent evidence indicates that retinal position and velocity errors both contribute to each type of eye movement (for reviews, see Krauzlis, 2005; de Xivry, & Lefévre, 2007).

The effect of a temporary absence of target velocity information on visual tracking