Abstract
Stabilometry and oculomotor examination was used to study 17 patients with spinocerebellar degeneration. The patients with a peak of over 2 Hz in the power spectra in stabilometry were examined for characteristic abnormalities in eye movement.The results of tests for pursuit eye movements, optokinetic nystagmus and visual suppression test were not related to the peak over 2 Hz in the power spectra of stabilometry. However, the occurrence of vertical saccadic eye movements was associated with the high frequency component over 2 Hz. The center of vertical saccade exists in the mesencephalic tegmentum.The cause of postural tremor at over 2 Hz is atrophy of the anterior lobe of the cerebellum, to which the proprioceptive afferents project via the mesencephalic tegmentum. The relationship between postural tremor and abnormalities in the vertical saccade may be due to a common lesion in the mesencephalic tegmentum.
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