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From the Department of Neurology, Ludwig-Maximilians University, Munich, Germany.
Address correspondence and reprint requests to Dr. S. Glasauer, Zentrum für Sensomotorik, Klinikum Grosshadern, University of Munich, Marchioninistrasse 23, 81377 Munich, Germany; e-mail: sglasauer{at}nefo.med.uni-muenchen.de
The increased postural sway of patients with disorders of the vestibular system improves with vision. The suppression of pathologic nystagmus also reduces sway. Because the latter effect cannot be attributed to retinal slip as a relevant feedback for postural control, the authors investigated how eye movements rather than retinal slip affect balance. They found that slow eye movements increase sway, possibly by an efference copy, which explains why spontaneous nystagmus causes postural imbalance.
This article was previously published in electronic format as an Expedited E-Pub on July 28, 2005, at www.neurology.org.
Supported by the Deutsche Forschungsgemeinschaft (STR 384/5-1 and GL 342/1-1).
Disclosure: The authors report no conflicts of interest.
Received March 4, 2005. Accepted in final form June 14, 2005.
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