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KMID : 1036520110010020118
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Clinical Neuro-Ophthalmology
2011 Volume.1 No. 2 p.118 ~ p.123
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Cerebellar Control of Eye Movement: Vision and VOR Interaction
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Lee Seung-Han
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Abstract
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The cerebellum plays a critical role in the control of eye movements. It helps to optimize ocular motor performance so that images of interest are promptly brought to the fovea and kept quietly there, so the brain can analyze and interpret the visual scene. It has been suggested that retinal signal errors provoke the flocculus/paraflocculus to improve vestibulo-ocular reflex (VOR) performance in an attempt to reduce retinal errors. The flocculus/paraflocculus appears to be important for adaptive change of the horizontal and the vertical VOR, especially for high-frequency vestibular response. It is also associated with sustained pursuit eye movements and gaze holding. The nodulus and ventral uvula exert an inhibitory influence on the velocity-storage mechanism. In normal individuals, post-rotatory nystagmus can be significantly shortened by tilting the head forward at the onset of post-rotatory nystagmus (tilt suppression). Excitation of the nodulus results in a reduced VOR time constant and reduced velocity storage.
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KEYWORD
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Cerebellum, Vestibulo-ocular reflex, Smooth pursuit, Nystagmus
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