Abstract
Sinusoidal stimulation of the horizontal semicircular canals was evaluated in 22 normal and 53 abnormal individuals. Nystagmic responses were analysed for both linearity and preponderance as a function of the period and specific frequency of stimulation. Many of the abnormal vestibular cases demonstrated a directional preponderance which, at low-frequency stimulation, was particularly suggestive of severe pathology. This examination enhanced the caloric evaluation, demonstrated possible mechanisms of compensation and provided a method of following changing pathologic conditions.