Cerebellar contribution to oculomotor function.

Normal 38 juvenile rhesus monkeys were used to study cerebellar contribution to oculomotor function. (1) Gaze nystagmus was seen only after bilateral flocculus lesions. (2) Spontaneous nystagmus was observed after nodulus, flocculus and cerebellar nuclei lesions. (3) OKN was severely impaired after bilateral flocculus and nodulus lesions. It was slightly impaired after dentate nucleus lesions in a long-term observation. (4) It is a very interesting finding that OKN is severely impaired after destruction of the flocculus and nodulus which have a very important role in the visual fixation.