Title
The effect of optokinetic stimulation on perceptual and postural symptoms in visual vestibular mismatch patients The effect of optokinetic stimulation on perceptual and postural symptoms in visual vestibular mismatch patients
Author
Faculty/Department
Faculty of Sciences. Physics
Faculty of Medicine and Health Sciences
Publication type
article
Publication
Subject
Physics
Human medicine
Engineering sciences. Technology
Source (journal)
PLoS ONE
Volume/pages
11(2016) :4 , 18 p.
ISSN
1932-6203
1932-6203
Article Reference
e0154528
Carrier
E
Target language
Dutch (dut)
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
Background Vestibular patients occasionally report aggravation or triggering of their symptoms by visual stimuli, which is called visual vestibular mismatch (VVM). These patients therefore experience discomfort, disorientation, dizziness and postural unsteadiness. Objective Firstly, we aimed to get a better insight in the underlying mechanism of VVM by examining perceptual and postural symptoms. Secondly, we wanted to investigate whether roll-motion is a necessary trait to evoke these symptoms or whether a complex but stationary visual pattern equally provokes them. Methods Nine VVM patients and healthy matched control group were examined by exposing both groups to a stationary stimulus as well as an optokinetic stimulus rotating around the naso-occipital axis for a prolonged period of time. Subjective visual vertical (SVV) measurements, posturography and relevant questionnaires were assessed. Results No significant differences between both groups were found for SVV measurements. Patients always swayed more and reported more symptoms than healthy controls. Prolonged exposure to roll-motion caused in patients and controls an increase in postural sway and symptoms. However, only VVM patients reported significantly more symptoms after prolonged exposure to the optokinetic stimulus compared to scores after exposure to a stationary stimulus. Conclusions VVM patients differ from healthy controls in postural and subjective symptoms and motion is a crucial factor in provoking these symptoms. A possible explanation could be a central visual-vestibular integration deficit, which has implications for diagnostics and clinical rehabilitation purposes. Future research should focus on the underlying central mechanism of VVM and the effectiveness of optokinetic stimulation in resolving it.
Full text (open access)
https://repository.uantwerpen.be/docman/irua/c4619b/133375.pdf
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