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Influence of vestibular and visual stimulation on split-belt walking

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Abstract

We investigated the influence of vestibular (caloric ear irrigation) and visual (optokinetic) stimulation on slow and fast split-belt walking. The velocity of one belt was fixed (1.5 or 5.0–6.0 km/h) and subjects (N = 8 for vestibular and N = 6 for visual experiments) were asked to adjust the velocity of the other belt to a level at which they perceived the velocity of both the belts as equal. Throughout all experiments, subjects bimanually held on to the space-fixed handles along the treadmill, which provided haptic information on body orientation. While the optokinetic stimulus (displayed on face-mounted virtual reality goggles) had no effect on belt velocity adjustments compared to control trials, cold-water ear irrigation during slow (but not fast) walking effectively influenced belt velocity adjustments in seven of eight subjects. Only two of these subjects decreased the velocity of the ipsilateral belt, consistent with the ipsilateral turning toward the irrigated ear in the Fukuda stepping test. The other five subjects, however, increased the velocity of the ipsilateral belt. A straight-ahead sense mechanism can explain both decreased and increased velocity adjustments. Subjects decrease or increase ipsilateral belt velocity depending on whether the vestibular stimulus is interpreted as an indicator of the straight-ahead direction (decreased velocity) or as an error signal relative to the straight-ahead direction provided by the haptic input from the space-fixed handles along the treadmill (increased velocity). The missing effect during fast walking corroborates the findings by others that the influence of vestibular tone asymmetry on locomotion decreases at higher gait velocities.

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Acknowledgments

Supported by Swiss National Science Foundation (#3200B0-105434, D. Straumann; #3200B0-105324, V. Dietz), Koetser Foundation for Brain Research, Zurich, Switzerland, and the Center of Integrative Human Physiology, University of Zurich, Switzerland. We thank one of the reviewers for pointing out the similarity between haptic and visual influences on the vestibular system.

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Authors and Affiliations

  1. Neurology Department, Zürich University Hospital, Frauenklinikstrasse 26, 8091, Zurich, Switzerland

    B. Marques, M. R. Dürsteler & D. Straumann

  2. Balgrist University Hospital, Zurich, Switzerland

    B. Marques, G. Colombo, R. Müller & V. Dietz

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  1. B. Marques
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  2. G. Colombo
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  3. R. Müller
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  4. M. R. Dürsteler
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  5. V. Dietz
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  6. D. Straumann
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Correspondence to D. Straumann.

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Marques, B., Colombo, G., Müller, R. et al. Influence of vestibular and visual stimulation on split-belt walking. Exp Brain Res 183, 457–463 (2007). https://doi.org/10.1007/s00221-007-1063-4

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  • DOI: https://doi.org/10.1007/s00221-007-1063-4

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