Distinction Between Smooth Pursuit, Optokinetic Nystagmus, and Ocular Following Response
Although we can clearly separate smooth pursuit from the vestibulo-ocular reflex, we can not always draw a clear separation between smooth pursuit and other tracking eye movements like the slow phase of the optokinetic nystagmus and the ocular following response (OFR), recently discovered by Miles, Kawano and Optican, which is a transient ocular traking response to full-field motion. The latter are both slow eye movements in response to extended targets, with the purpose of stabilizing the image. Therefore, some processing stages are shared with the smooth pursuit system. Those different kinds of eye movements may not be simply differentiated by the stimulus that is appropriate to generate them, as smooth pursuit eye movements can be generated to track extended targets as well. The main difference may lie in the voluntary nature of pursuit eye movements.
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