Vestibular contribution to combined arm and trunk motion |
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Authors: | Franck?Mars Philippe?S?Archambault Email author" target="_blank">Anatol?G?FeldmanEmail author |
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Institution: | (1) Institut de Réadaptation de Montréal, Université de Montréal et Centre de Recherche Interdisciplinaire en Réadaptation, 6300 Darlington, H3S 2J4, Montreal, Quebec, Canada, |
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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.
Electronic Publication |
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Keywords: | Motor control Pointing Reaching Galvanic vestibular stimulation Interjoint coordination |
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