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In this investigation of the interaction between the visual and vestibular systems in patients with focal lesions of the central nervous system, the visual vestibulo-ocular reflex (VVOR) gain and the vestibulo-ocular reflex (VOR) gain in 13 normal subjects and 64 patients with central nervous system disorders were analyzed by a mini-computer (PDP 11/34) with harmonic sinusoidal rotation and optokinetic stationary stimuli. The test subjects were rotated sinusoidally at an amplitude of 120° and at a frequency of 0.1Hz (maximum velocity 75.4°/s), with eyes both closed and open.<BR>In 64 patients with central nervous system disorders, many types of abnormal VOR and VVOR gains were observed. Decreased VOR and VVOR gains were frequently seen in patients with brainstem lesions. Our results of VOR and VVOR tests indicated that: 1) these tests are useful not only as screening tests but also for the topodiagnostic evaluation of central nervous system lesions; 2)they are useful and appropriate system for following the progress of the disease ; 3)some patients with central nervous system lesions showed a change, either a decrease or an increase of VOR.
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