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A Survey of Common Abnormalities

Leslie J. Findley, MD; Michael A. Gresty, PhD; Michael G. Halmagyi, MD

Arch Neurol. 1981;38(1):38-42.

Abstract
• A novel technique uses a Schottky barrier photodetector to record abnormal movements of the arms in diseases of the nervous system. The method transduces displacement of the freely moving limbs, producing recordings that readily relate to clinical observation and provide quantification. This article gives examples of the use of the technique for examining ataxia in finger-to-nose testing, tremor, and cogwheel phenomena in common neurological conditions.

Author Affiliations
From the Medical Research Council, Hearing and Balance Unit, Institute of Neurology, National Hospital, London (Drs Findley and Gresty); and the Royal Prince Alfred Hospital, Sydney, Australia (Dr Halmagyi).

Footnotes
Accepted for publication Feb 18, 1980.

Reprint requests to Medical Research Council, Hearing and Balance Unit, Institute of Neurology, National Hospital, Queen Square, London WC1N 3BG England (Dr Findley).

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