| Popis: |
EXAMINATION of the vestibular system is usually undertaken by the classical methods introduced by Barany in 1907. 1 The deficiencies of these methods have recently been described by several authors (van Egmond, Groen, and Jongkees, 2 Groen and Jongkees 3 and Hulk 4 ). Egmond, Jongkees, and Groen introduced a new method of investigation called cupulometry. The principle of this method is the investigation of the after-sensation of turning and postrotatory nystagmus after well-defined decelerations from below the threshold. Cupulometry is of great value, but the recording of sensation alone gives the resultant of the function in all the vestibular pathways, including the cortex. Direct observation of the postrotatory nystagmus does not permit quantitative estimation apart from duration of nystagmus. A differential diagnosis of localization is therefore uncertain by means of this method. In our opinion, a quantitative investigation of the vestibular function involves registration of nystagmus. Nystagmus has been exactly |
