Absence of a vergence-mediated vestibulo-ocular reflex gain increase does not preclude adaptation
In: Journal of Vestibular Research, Jg. 31 (2021-03-10), S. 109-117
Online
unknown
Zugriff:
BACKGROUND: The gain (eye-velocity/head-velocity) of the angular vestibuloocular reflex (aVOR) during head impulses can be increased while viewing near-targets and when exposed to unilateral, incremental retinal image velocity error signals. It is not clear however, whether the tonic or phasic vestibular pathways mediate these gain increases. OBJECTIVE: Determine whether a shared pathway is responsible for gain enhancement between vergence and adaptation of aVOR gain in patients with unilateral vestibular hypofunction (UVH). MATERIAL AND METHODS: 20 patients with UVH were examined for change in aVOR gain during a vergence task and after 15-minutes of ipsilesional incremental VOR adaptation (uIVA) using StableEyes (a device that controls a laser target as a function of head velocity) during horizontal passive head impulses. A 5 % aVOR gain increase was defined as the threshold for significant change. RESULTS: 11/20 patients had >5% vergence-mediated gain increase during ipsi-lesional impulses. For uIVA, 10/20 patients had >5% ipsi-lesional gain increase. There was no correlation between the vergence-mediated gain increase and gain increase after uIVA training. CONCLUSION: Vergence-enhanced and uIVA training gain increases are mediated by separate mechanisms and/or vestibular pathways (tonic/phasic). The ability to increase the aVOR gain during vergence is not prognostic for successful adaptation training.
Titel: |
Absence of a vergence-mediated vestibulo-ocular reflex gain increase does not preclude adaptation
|
---|---|
Autor/in / Beteiligte Person: | Schubert, Michael C. ; Büki, Béla ; Todd, Christopher J. ; Migliaccio, Americo A. ; Tamás, László T. |
Link: | |
Zeitschrift: | Journal of Vestibular Research, Jg. 31 (2021-03-10), S. 109-117 |
Veröffentlichung: | IOS Press, 2021 |
Medientyp: | unknown |
ISSN: | 1878-6464 (print) ; 0957-4271 (print) |
DOI: | 10.3233/ves-201560 |
Schlagwort: |
|
Sonstiges: |
|