Subjective Visual Vertical during Caloric Stimulation in Healthy Subjects: Implications to Research and Neurorehabilitation

Funabashi, Martha; Flores, Aline I.; Vicentino, Amanda; Barros, Camila Giacomo Carneiro; Pontes-Neto, Octávio M.; Leite, João P.; Santos-Pontelli, Taiza E. G.

doi:10.1155/2015/367695

Cited by 4 publications

(3 citation statements)

References 20 publications

(22 reference statements)

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“…By assessing perceived orientation of the vertical plane, the SVV test effectively evaluates for a discrepancy between the utricular input arising from each ear (Friedmann, 1971 ; Dieterich and Brandt, 1993 ; Schonfeld et al, 2010 ; Funabashi et al, 2015 ). Acute, unilateral peripheral vestibular hypofunction is commonly characterized by, among other symptoms, the presence of a perceptual tilt towards the compromised ear.…”

Section: Introductionmentioning

confidence: 99%

Stimulation from Cochlear Implant Electrodes Assists with Recovery from Asymmetric Perceptual Tilt: Evidence from the Subjective Visual Vertical Test

Gnanasegaram

Parkes

Cushing

et al. 2016

Front. Integr. Neurosci.

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Vestibular end organ impairment is highly prevalent in children who have sensorineural hearing loss (SNHL) rehabilitated with cochlear implants (CIs). As a result, spatial perception is likely to be impacted in this population. Of particular interest is the perception of visual vertical because it reflects a perceptual tilt in the roll axis and is sensitive to an imbalance in otolith function. The objectives of the present study were thus to identify abnormalities in perception of the vertical plane in children with SNHL and determine whether such abnormalities could be resolved with stimulation from the CI. Participants included 53 children (15.2 ± 4.0 years of age) with SNHL and vestibular loss, confirmed with vestibular evoked myogenic potential (VEMP) testing. Testing protocol was validated in a sample of nine young adults with normal hearing (28.8 ± 7.7 years). Perception of visual vertical was assessed using the static Subjective Visual Vertical (SVV) test performed with and without stimulation in the participants with cochleovestibular loss. Trains of electrical pulses were delivered by an electrode in the left and/or right ear. Asymmetric spatial orientation deficits were found in nearly half of the participants with CIs (24/53 [45%]). The abnormal perception in this cohort was exacerbated by visual tilts in the direction of their deficit. Electric pulse trains delivered using the CI shifted this abnormal perception towards center (i.e., normal; p = 0.007). Importantly, this benefit was realized regardless of which ear was stimulated. These results suggest a role for CI stimulation beyond the auditory system, in particular, for improving vestibular/balance function.

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Section: Introductionmentioning

confidence: 99%

Stimulation from Cochlear Implant Electrodes Assists with Recovery from Asymmetric Perceptual Tilt: Evidence from the Subjective Visual Vertical Test

Gnanasegaram

Parkes

Cushing

et al. 2016

Front. Integr. Neurosci.

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“…This hypothesis was supported by the study on the SVV test with caloric stimulation. [19] They did not find any effect of the horizontal canal on SVV. Vingerhoets et al [20] also measured SVV under constant velocity rotation and concluded that egocentric bias was more dominant than the idiotrophic vector under dynamic conditions.…”

Section: Discussionmentioning

confidence: 90%

The effect of head roll and soft surface on Virtual SVV in healthy subjects: A normalization study

Ardıç¹,

Şentürk²,

Çil³

2020

ENT Updates

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Objective: The utricle is a crucial structure for a sense of gravity, but the contribution of proprioceptive receptors is also essential. This study aimed to measure the effect of head roll and soft surface on subjective visual vertical (SVV) in healthy subjects to determine the effect of neck and plantar proprioceptive inputs. Methods: In the first experiment, 78 healthy subjects performed 0, 15, 30, and 45-degree head rolls to the left and right side while standing. Three measurements were performed in every position. In the second experiment, 40 healthy subjects performed the same head maneuvers on a 20 cm thick soft surface. The Virtual SVV system (Virtual SVVTM, Interacoustics, Denmark) was utilized for all measurements. Results: The mean SVV on a hard surface was-0.99±2.34 degree at 0°. The SVV deviation increased with increasing head roll angle. The head roll to the right on a hard surface resulted in significantly different SVV angles than the neutral position (p<0.05). There was no significant difference in left head roll positions except at 15° (p>0.05). SVV deviation increased on the soft surface. Nevertheless, there was no significant difference between the two surface conditions. Conclusion: The new Virtual SVV system measures SVV accurately. SVV deviation in the neutral position is similar to published results. However, under stress conditions such as with head roll and on a soft surface, every clinic has to set their normative data before comparing patients.

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“…However, the caloric test is very well known to trigger only the horizontal canal [Shepard and Jacobson, 2016]. Thus, such phenomenon is very unlikely to alter SVV perception given that (i) the SVV outcomes are more related to otolithic activity [Jaeger et al, 2008; Kumagami et al, 2009] and (ii) the classical caloric test does not modulate SVV perception in healthy participants [Funabashi et al, 2015]. Therefore, we are confident that our results cannot be linked to any potential caloric effect.…”

Section: Methodsmentioning

confidence: 99%

Vestibular Extremely Low‐Frequency Magnetic and Electric Stimulation Effects on Human Subjective Visual Vertical Perception

Bouisset

Villard

Legros

2022

Bioelectromagnetics

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Electric fields from both extremely low-frequency magnetic fields (ELF-MF) and alternating current (AC) stimulations impact human neurophysiology. As the retinal photoreceptors, vestibular hair cells are graded potential cells and are sensitive to electric fields. Electrophosphene and magnetophosphene literature suggests different impacts of AC and ELF-MF on the vestibular hair cells. Furthermore, while AC modulates the vestibular system more globally, lateral ELF-MF stimulations could be more utricular specific. Therefore, to further address the impact of ELF-MFinduced electric fields on the human vestibular system and the potential differences with AC stimulations, we investigated the effects of both stimulation modalities on the perception of verticality using a subjective visual vertical (SVV) paradigm. For similar levels of SVV precision, the ELF-MF condition required more time to adjust SVV, and SVV variability was higher with ELF-MF than with AC vestibular-specific stimulations. Yet, the differences between AC and ELF-MF stimulations were small. Overall, this study highlights small differences between AC and ELF-MF vestibular stimulations, underlines a potential utricular contribution, and has implications for international exposure guidelines and standards. Bioelectromagnetics. 43:355-367, 2022

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Subjective Visual Vertical during Caloric Stimulation in Healthy Subjects: Implications to Research and Neurorehabilitation

Cited by 4 publications

References 20 publications

Stimulation from Cochlear Implant Electrodes Assists with Recovery from Asymmetric Perceptual Tilt: Evidence from the Subjective Visual Vertical Test

Stimulation from Cochlear Implant Electrodes Assists with Recovery from Asymmetric Perceptual Tilt: Evidence from the Subjective Visual Vertical Test

The effect of head roll and soft surface on Virtual SVV in healthy subjects: A normalization study

Vestibular Extremely Low‐Frequency Magnetic and Electric Stimulation Effects on Human Subjective Visual Vertical Perception

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