CHANGES OF LABYRINTHINE EXCITABILITY IN LESIONS OF OPTIO TRACT OR EXTERNAL GENICULATE BODY

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Abstract
Little is known as to whether retinal impulses are able to influence the excitability of the vestibulo-ocular reflex arc. Ohm1 observed that postrotational nystagmus is different in the dark and in the light. It is, however, not clear from his experiments whether the differences observed were due to the changes in the illumination or to the influence of fixation. In experimental studies of Spiegel,2 it was shown that the effect of stimulation of the occipital lobe on ocular movements is changed by a lesion of the vestibular nuclei. While horizontal conjugate deviation of the eyeballs predominated as long as the vestibular nuclei were intact, the stimulation of the occipital lobes following bilateral lesions of the vestibular nuclei produced chiefly vertical ocular movements. These experiments were interpreted as indicating that the impulses for horizontal ocular movements descending from the occipital lobe reach the nuclei of the ocular muscles after

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