The question of whether habituation of optokinetic nystagmus occurs with repetitive stimulation was studied in a series of trials in 15 human subjects. The results indicate that there is no response decline characteristic of habituation, but on the contrary a constant and definite increase of optokinetic response, interpreted as the result of a positive learning process. The latter does not influence or modify the caloric, rotatory and galvanic vestibular responses. Acta Otolaryng 75Acta Otolaryngol Downloaded from informahealthcare.com by Nyu Medical Center on 07/27/15 For personal use only. Acta Otolaryrig 75 Acta Otolaryngol Downloaded from informahealthcare.com by Nyu Medical Center on 07/27/15 For personal use only. Acta Otolaryngol Downloaded from informahealthcare.com by Nyu Medical Center on 07/27/15 For personal use only.

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In the present study, the authors are presenting their otoneurological findings made in a series of about 100 patients suffering from vestibular dysfunctions caused by a well-defined lesion of the peripheral neuron and/or the central nervous system. Transient and incomplete blockage of the peripheral neuron such as in cases of Bell’s palsy do neither impair accommodation nor recovery. In combined peripheral and central lesions (e.g. acoustic neuroma at an advanced stage), both accommodation and central substitution mechanisms are impaired. Delayed or incomplete compensation of peripheral and/or central vestibular disorders is probably related to lesions of the vestibular nuclei (accommodation), of the reticular formation and of the cerebellum (optic and somatosensory regulations).

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