Eye movement related neurons in the cerebellar nuclei of the alert monkey

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Abstract
In all cerebellar nuclei saccade related neurons can be recorded. In the alert untrained Rhesus monkey these neurons can be classified into short-lead bursters, complex bursters, and tonic burst neurons. Short-lead bursters can be related to the onset or to the length of saccades and blinks. Complex bursters are active in the early (acceleration) or late (deceleration) phase of saccades. Tonic burst neurons, in addition, display maintained activity which is modulated in a complex manner with eye position, during periods of fixation or slow-phase nystagmus. In agreement with clinical and previous experimental data we view these cerebellar output neurons as elements which are not part of the system which basically generates eye movements, but rather as a system which could influence the execution of movements.