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Some Theoretical and Practical Considerations

Joseph A. McClure, MD; Paul Lycett

Arch Otolaryngol. 1983;109(10):682-687.

Abstract
• Pathological vestibular asymmetry can be divided into static and dynamic types. Static asymmetry results from a unilateral change of the resting neural input. Acute, chronic, and recovery stages can be recognized if one interprets the direction and intensity of the resultant spontaneous nystagmus relative to the clinical picture. Static asymmetry is additive with induced asymmetry and manifests itself as directional preponderance or as the direction-fixed or direction-changing feature of positional nystagmus. Dynamic asymmetry refers to abnormal asymmetry induced by normal head movements. For example, with unilateral hypo-function, a greater gain is observed with head movement toward the unaffected side, suggesting nonlinearity as specified by Ewald's second law. Visually induced vestibular asymmetry is a form of dynamic asymmetry generated by convergence of visual-vestibular information, and causing symptoms in certain "motion-active" visual environments.

(Arch Otolaryngol 1983;109:682-687)

Author Affiliations
From the Department of Otolaryngology, University of Western Ontario and University Hospital, London, Ontario, Canada.

Footnotes
Accepted for publication April 22, 1983.

Reprint requests to Department of Otolaryngology, University Hospital, London, Ontario, Canada N6A 5A5 (Dr McClure).

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