The vestibular cerebellum plays a major role in the control of slow ocular movements. A study of 12 patients with localized lesions of the paleo- and neo-cerebellum demonstrated that these structures participate in the organization of visual tracking movements. These patients often have disturbances of ocular statics as well and this can be the cause of slow movement disturbances. In most cases, ataxia of the tracking movement is not related to a statics disorder but on the contrary, to disturbances of the movement itself. The 2 cerebellar levels involved in ocular motility are apparently related to 2 different types of movement strategies: vestibular cerebellar tracking having the very elementary function of maintaining fixation within the overall picture of postural regulation; neo-cerebellar tracking being already the beginning of voluntary motility.