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Vestibular loss disrupts visual reactivity in the alpha EEG rhythm

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dc.contributor.authorIbitoye, Richard
dc.contributor.authorCastro, Patricia
dc.contributor.authorEllmers, Toby
dc.contributor.authorKaski, Diego
dc.contributor.authorBronstein, Adolfo
dc.date.accessioned2024-06-05T14:13:22Z
dc.date.available2024-06-05T14:13:22Z
dc.date.issued2023
dc.description.abstractThe alpha rhythm is a dominant electroencephalographic oscillation relevant to sensory-motor and cognitive function. Alpha oscillations are reactive, being for example enhanced by eye closure, and suppressed following eye opening. The determinants of inter-individual variability in reactivity in the alpha rhythm (e.g. changes with amplitude following eye closure) are not fully understood despite the physiological and clinical applicability of this phenomenon, as indicated by the fact that ageing and neurodegeneration reduce reactivity. Strong interactions between visual and vestibular systems raise the theoretical possibility that the vestibular system plays a role in alpha reactivity. To test this hypothesis, we applied electroencephalography in sitting and standing postures in 15 participants with reduced vestibular function (bilateral vestibulopathy, median age = 70 years, interquartile range = 51-77 years) and 15 age-matched controls. We found participants with reduced vestibular function showed less enhancement of alpha electroencephalography power on eye closure in frontoparietal areas, compared to controls. In participants with reduced vestibular function, video head impulse test gain - as a measure of residual vestibulo-ocular reflex function - correlated with reactivity in alpha power across most of the head. Greater reliance on visual input for spatial orientation ('visual dependence', measured with the rod-and-disc test) correlated with less alpha enhancement on eye closure only in participants with reduced vestibular function, and this was partially moderated by video head impulse test gain. Our results demonstrate for the first time that vestibular function influences alpha reactivity. The results are partly explained by the lack of ascending peripheral vestibular input but also by central reorganisation of processing relevant to visuo-vestibular judgements.
dc.description.versionAceptada
dc.identifier.citationIbitoye RT, Castro P, Ellmers TJ, Kaski DN, Bronstein AM. Vestibular loss disrupts visual reactivity in the alpha EEG rhythm. Neuroimage Clin. 2023;39:103469. doi: 10.1016/j.nicl.2023.103469
dc.identifier.doihttps://doi.org/10.1016/j.nicl.2023.103469
dc.identifier.urihttps://hdl.handle.net/11447/9036
dc.language.isoen
dc.subjectAlpha rhythm
dc.subjectReactivity
dc.subjectVestibular
dc.subjectVestibulopathy
dc.subjectVisual Dependence
dc.titleVestibular loss disrupts visual reactivity in the alpha EEG rhythm
dc.typeArticle
dcterms.accessRightsAcceso Abierto
dcterms.sourceNeuroImage: Clinical
dspace.entity.typePublication
relation.isAuthorOfPublication47f1541f-afb3-4857-a3ce-1ee337beed72
relation.isAuthorOfPublication.latestForDiscovery47f1541f-afb3-4857-a3ce-1ee337beed72

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