Galvanically induced asymmetric optokinetic after-nystagmus
Brantberg, K and Magnusson, Måns LU
(1990)
In Acta Oto-Laryngologica
110(3-4).
p.95-189
- Abstract
The effect of an asymmetric vestibular input on the symmetry of horizontal optokinetic after-nystagmus (OKAN) was studied in twenty healthy subjects. Optokinetic nystagmus (OKN) was elicited by a whole-field optokinetic drug, rotating at 90 degrees/s, and eye-movements were recorded by a DC electro-oculographic technique (EOG). The ratio of OKAN following right and left-beating OKN respectively was computed. An asymmetric vestibular input was generated by a continuous bi-polar, bi-aural galvanic stimulus (1 mA) to the vestibular nerves during the optokinetic stimulation and the recording of the OKAN. During galvanic stimulation the relation between left and right-beating OKAN was asymmetric, compared with the OKAN found after... (More)
The effect of an asymmetric vestibular input on the symmetry of horizontal optokinetic after-nystagmus (OKAN) was studied in twenty healthy subjects. Optokinetic nystagmus (OKN) was elicited by a whole-field optokinetic drug, rotating at 90 degrees/s, and eye-movements were recorded by a DC electro-oculographic technique (EOG). The ratio of OKAN following right and left-beating OKN respectively was computed. An asymmetric vestibular input was generated by a continuous bi-polar, bi-aural galvanic stimulus (1 mA) to the vestibular nerves during the optokinetic stimulation and the recording of the OKAN. During galvanic stimulation the relation between left and right-beating OKAN was asymmetric, compared with the OKAN found after optokinetic stimulation only. The galvanic stimulus caused a preponderance for OKAN with the fast phase beating toward the cathode. Thus, the small vestibular asymmetry induced by the galvanic stimulus, which was not strong enough to produce nystagmus by itself, caused an asymmetric OKAN. These findings suggest that examination of OKAN may be of value to detect small vestibular asymmetries in peripheral vestibular disorders in man.
(Less)
- author
- Brantberg, K
and Magnusson, Måns
LU
- organization
- publishing date
- 1990-09-01
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Adult, Electric Stimulation, Electrooculography, Female, Humans, Male, Middle Aged, Nystagmus, Physiologic, Vestibular Nerve, Journal Article, Research Support, Non-U.S. Gov't
- in
- Acta Oto-Laryngologica
- volume
- 110
- issue
- 3-4
- pages
- 95 - 189
- publisher
- Taylor & Francis
- external identifiers
-
- pmid:2239206
- scopus:0025180363
- ISSN
- 0001-6489
- language
- English
- LU publication?
- yes
- id
- 6592daf4-296f-49dc-b8bd-a7454783e4dd
- date added to LUP
- 2017-05-03 12:44:59
- date last changed
- 2024-01-13 19:54:21
@article{6592daf4-296f-49dc-b8bd-a7454783e4dd,
abstract = {{<p>The effect of an asymmetric vestibular input on the symmetry of horizontal optokinetic after-nystagmus (OKAN) was studied in twenty healthy subjects. Optokinetic nystagmus (OKN) was elicited by a whole-field optokinetic drug, rotating at 90 degrees/s, and eye-movements were recorded by a DC electro-oculographic technique (EOG). The ratio of OKAN following right and left-beating OKN respectively was computed. An asymmetric vestibular input was generated by a continuous bi-polar, bi-aural galvanic stimulus (1 mA) to the vestibular nerves during the optokinetic stimulation and the recording of the OKAN. During galvanic stimulation the relation between left and right-beating OKAN was asymmetric, compared with the OKAN found after optokinetic stimulation only. The galvanic stimulus caused a preponderance for OKAN with the fast phase beating toward the cathode. Thus, the small vestibular asymmetry induced by the galvanic stimulus, which was not strong enough to produce nystagmus by itself, caused an asymmetric OKAN. These findings suggest that examination of OKAN may be of value to detect small vestibular asymmetries in peripheral vestibular disorders in man.</p>}},
author = {{Brantberg, K and Magnusson, Måns}},
issn = {{0001-6489}},
keywords = {{Adult; Electric Stimulation; Electrooculography; Female; Humans; Male; Middle Aged; Nystagmus, Physiologic; Vestibular Nerve; Journal Article; Research Support, Non-U.S. Gov't}},
language = {{eng}},
month = {{09}},
number = {{3-4}},
pages = {{95--189}},
publisher = {{Taylor & Francis}},
series = {{Acta Oto-Laryngologica}},
title = {{Galvanically induced asymmetric optokinetic after-nystagmus}},
volume = {{110}},
year = {{1990}},
}