Optokinetic responses (OKRs) are reflexive eye movements induced by a moving visual pattern (Collewijn, 1991; Distler and Hoffmann, 2003; Stahl, 2004, 2008; Leigh and Zee, 2006; Buttner and Kremmyda, 2007; Kodama and du Lac, 2016). When a visual pattern starts to move, the eyes begin to move toward the direction of the stimulus motion to produce an initial phase OKR. If the movement of the visual pattern continues for a longer duration, slow tracking eye movements are interrupted by prompt eye movements that reset the eye to its primary position, thus constituting a late-phase OKR. This ocular response of alternating slow tracking and quick resetting eye movements is also known as optokinetic nystagmus (OKN).
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