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Vertical torque responses to vestibular stimulation in standing humans
| Content Provider | Scilit |
|---|---|
| Author | Reynolds, Raymond F. |
| Copyright Year | 2011 |
| Description | Journal: The Journal of physiology The effects of electrical vestibular stimulation upon movement and perception suggest two evoked sensations: head roll and inter-aural linear acceleration. The head roll vector causes walking subjects to turn in a direction dependent on head pitch, requiring generation of torque around a vertical axis. Here the effect of vestibular stimulation upon vertical torque (T(z)) was investigated during quiet stance. With the head tilted forward, square-wave stimuli applied to the mastoid processes evoked a polarity-specific T(z) response accompanied by trunk yaw. Stochastic vestibular stimulation (SVS) was used to investigate the effect of head pitch with greater precision; the SVS–T(z) cross-correlation displayed a modulation pattern consistent with the head roll vector and this was also reflected by changes in coherence at 2–3 Hz. However, a separate response at 7–8 Hz was unaffected by head pitch. Head translation (rather than rotation) had no effect upon this high frequency response either, suggesting it is not caused by a sense of body rotation induced by an inter-aural acceleration vector offset from the body. Instead, high coherence between medio-lateral shear force and T(z) at the same frequency range suggests it is caused by mechanical coupling to evoked medio-lateral sway. Consistent with this explanation, the 7–8 Hz response was attenuated by 90 deg head roll or yaw, both of which uncouple the inter-aural axis from the medio-lateral sway axis. These results demonstrate two vertical torque responses to electrical vestibular stimulation in standing subjects. The high frequency response can be attributed to mechanical coupling to evoked medio-lateral sway. The low frequency response is consistent with a reaction to a sensation of head roll, and provides a novel method for investigating proprioceptive-vestibular interactions during stance. |
| Related Links | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3179994/pdf |
| Ending Page | 3953 |
| Page Count | 11 |
| Starting Page | 3943 |
| ISSN | 00223751 |
| e-ISSN | 14697793 |
| DOI | 10.1113/jphysiol.2011.209163 |
| Journal | The Journal of physiology |
| Issue Number | 16 |
| Volume Number | 589 |
| Language | English |
| Publisher | Wiley-Blackwell |
| Publisher Date | 2011-08-15 |
| Access Restriction | Open |
| Subject Keyword | Journal: The Journal of physiology Vestibular Stimulation Linear Acceleration |
| Content Type | Text |
| Resource Type | Article |
| Subject | Physiology Sports Science |
