A study was carried out on vestibular and cochlear measures of 20 patients with internal ear disorders. It was shown that the vestibular findings do not always match the cochlear ones. A comparison of the various quantitative measures of the post-caloric responses with the clinical picture indicated that the average slow-phase velocity provides a good measure of the vestibular function. The correlation coefficients between the average slow-phase velocity of the post-caloric responses and those of the per- and post-rotatory responses were higher than those based on the maximum slow-phase velocity value. The diagnostic significance of the rotatory test is assessed against the clinical findings.