No evidence for stochastic resonance effects on standing balance when applying noisy galvanic vestibular stimulation in young healthy adults

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2021
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Giboin, Lois Solal
Schniepp, Roman
Wuehr, Max
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Scientific reports. Springer Nature. 2021, 11(1), 12327. eISSN 2045-2322. Available under: doi: 10.1038/s41598-021-91808-w
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Noisy galvanic vestibular stimulation (nGVS) at imperceptible levels has been shown to reduce body sway. This reduction was commonly attributed to the mechanism of stochastic resonance (SR). However, it has never been explicitly tested whether nGVS-induced effects on body sway consistently follow a SR-like bell-shaped performance curve with maximal reductions in a particular range of noise intensities. To test this, body sway in 21 young healthy participants was measured during varying nGVS amplitudes while standing with eyes closed in 3 conditions (quiet stance, sway referencing, sinusoidal platform tilts). Presence of SR-like response dynamics in each trial was assessed (1) by a goodness-of-fit analysis using an established SR-curve model and (2) by ratings from 3 human experts. In accordance to theory, we found reductions of body sway at one nGVS amplitude in most trials (75-95%). However, only few trials exhibited SR-like bell-shaped performance curves with increasing noise amplitudes (10-33%). Instead, body sway measures rather fluctuated randomly across nGVS amplitudes. This implies that, at least in young healthy adults, nGVS effects on body sway are incompatible with SR. Thus, previously reported reductions of body sway at particular nGVS intensities more likely result from inherent variations of the performance metric or by other yet unknown mechanisms.

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ISO 690ASSLÄNDER, Lorenz, Lois Solal GIBOIN, Markus GRUBER, Roman SCHNIEPP, Max WUEHR, 2021. No evidence for stochastic resonance effects on standing balance when applying noisy galvanic vestibular stimulation in young healthy adults. In: Scientific reports. Springer Nature. 2021, 11(1), 12327. eISSN 2045-2322. Available under: doi: 10.1038/s41598-021-91808-w
BibTex
@article{Asslander2021-06-10evide-54079,
  year={2021},
  doi={10.1038/s41598-021-91808-w},
  title={No evidence for stochastic resonance effects on standing balance when applying noisy galvanic vestibular stimulation in young healthy adults},
  number={1},
  volume={11},
  journal={Scientific reports},
  author={Assländer, Lorenz and Giboin, Lois Solal and Gruber, Markus and Schniepp, Roman and Wuehr, Max},
  note={Article Number: 12327}
}
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