Directional Preponderance in Some Intracranial Disorders

Abstract

This study is an attempt to clarify the clinical importance of the symptom of directional preponderance, and for that purpose we have systematically studied its occurrence in various intracranial disorders, preferably such groups in which the pathology and localization of the lesion were known.

All our examinations were carried out according to the technique of Fitzgerald and Hallpike, and we classified as directional preponderance all cases which revealed a significant difference between the durations of nystagmus to the right and to the left. Cases with spontaneous nystagmus, monaural hypofunction or disease of the middle ear were excluded.