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Transient eye deviation on head rotation was electronystamographically observed during the examination of positional nystagmus with eyes closed. In 98.8% of the 1419 electronystacmograms, transient eye deviations were of same direction as that of the head rotation. In 0.6%, those deviations were observed only on head rotation to one direction, in 0.4% were not recognized on head rotation to either direction and in 0.2 of showed to be to the opposite direction to that of head rotation due to the vestibuloocular reflex-Most of latter three groups were those with conjugate gaze palsy, abducens palsy, congenital blindness, or lesions in the paraportine reticular formation. Based on these findings, it is suspected that this transient deviation of the closed eyes on head rotation is similar to the saccadic movement of lateral gaze that was discussed in the eye-head coordination by Bizi et al (1972). In other words, after the system of lateral gaze is completed in the central nervous system, this saccadic eye movement may be elicited without visual input by head rotation alone.
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