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Vestibular contribution to combined arm and trunk motion

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Abstract

Recent studies have shown that the hand-pointing movements within arm's reach remain invariant whether the trunk is recruited or not or its motion is unexpectedly prevented. This suggests the presence of compensatory arm-trunk coordination minimizing the deflections of the hand from the intended trajectory. It has been postulated that vestibular signals elicited by the trunk motion and transmitted to the arm motor system play a major role in the compensation. One prediction of this hypothesis is that vestibular stimulation should influence arm posture and movement during reaching. It has been demonstrated that galvanic vestibular stimulation (GVS) can influence the direction of pointing movements when body motion is restrained. In the present study, we analyzed the effects of GVS on trunk-assisted pointing movements. Subjects either moved the hand to a target or maintained a steady-state posture near the target, while moving the trunk forward with the eyes closed. When GVS was applied, the final position of the hand was deviated in the lateral and sagittal direction in both tasks. This was the result of two independent effects: a deviation of the trunk trajectory and a modification of the arm position relative to the trunk. Thus, the vestibular system might be directly involved not only in the control of trunk motion but also in the arm-trunk coordination during trunk-assisted reaching movements.

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Acknowledgements

This work was supported by a grant from CIHR and FCAR-centre (Canada). The authors are thankful to two anonymous reviewers for their comments on a previous version of the manuscript.

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  1. Institut de Réadaptation de Montréal, Université de Montréal et Centre de Recherche Interdisciplinaire en Réadaptation, 6300 Darlington, Montreal, Quebec, H3S 2J4, Canada

    Franck Mars, Philippe S. Archambault & Anatol G. Feldman

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  1. Franck Mars
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  2. Philippe S. Archambault
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  3. Anatol G. Feldman
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Correspondence to Anatol G. Feldman.

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Mars, F., Archambault, P.S. & Feldman, A.G. Vestibular contribution to combined arm and trunk motion. Exp Brain Res 150, 515–519 (2003). https://doi.org/10.1007/s00221-003-1485-6

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  • DOI: https://doi.org/10.1007/s00221-003-1485-6

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