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Effect of vergence on the gain of the linear vestibulo-ocular reflexWe measured the linear vestibulo-ocular reflex (LVOR) and vergence, using binocular search coils, in 3 humans. The subjects were accelerated sinusoidally at 0.5 Hz and 0.2 g peak acceleration, in complete darkness, while performing three different tasks: i) mental arithmetic; ii) tracking a remembered target at either 0.34 m or 0.14 m distance; and iii) maintaining vergence at either of these distances by means of audio biofeedback based on vergence. Subjects could control vergence using the audio feedback; there was greater convergence with the near audio target. However, there was no significant difference in vergence between the near and far remembered target conditions. With audio feedback, the amplitude of smooth tracking was not consistently different for the near and the far conditions. However, the amplitude of tracking (saccades and smooth component) in the remembered target conditions was greater for near than for far targets. These results suggest that linear VOR amplitude is not determined by vergence alone.
Document ID
20050000250
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Shelhamer, M.
(Johns Hopkins University, School of Medicine Baltimore, MD, United States)
Merfeld, D. M.
Mendoza, J. C.
Paloski, W. H.
Date Acquired
August 22, 2013
Publication Date
January 1, 1995
Publication Information
Publication: Acta oto-laryngologica. Supplementum
Volume: 520 Pt 1
ISSN: 0365-5237
Subject Category
Aerospace Medicine
Distribution Limits
Public
Copyright
Other
Keywords
NASA Program Space Physiology and Countermeasures
NASA Discipline Number 16-10
NASA Discipline Neuroscience
NASA Center JSC

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