A Y

Directional preponderance to the right

With cold water, current flows away from the ampulla

Electronystagmography: The potential difference across the eye (the corneoretinal potential) permits recording of eye movements with laterally placed electrodes and enables detection of spontaneous or reflex induced nystagmus in darkness or with eyes closed.

This eliminates optical fixation which may reduce or even abolish nystagmus. Canal paresis implies reduced duration of nystagmus on one side. It may result from either a peripheral or central (brain stem or cerebellum) lesion on that side.

Directional preponderance implies a more prolonged duration of nystagmus in one direction than the other. It may result from a central lesion on the side of the preponderance or from a peripheral lesion on the other side. These tests combined with audiometry' should differentiate a peripheral from a central lesion.

SECTION III

CLINICAL PRESENTATION ANATOMICAL CONCEPTS AND DIAGNOSTIC APPROACH

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