基于头位电触觉舌生物反馈的平衡控制感觉补充系统
Sensory supplementation system based on electrotactile tongue biofeedback of head position for balance control
摘要：
本研究旨在探讨基于人工头部位置的舌电触觉生物反馈对安静站立时不同体感条件下的姿势控制的影响。要求八名年轻健康的成年人在无生物反馈和生物反馈两种条件下，在两种硬质和泡沫支撑表面条件下，闭上眼睛尽可能不动地站立。在泡沫条件下，将6 cm厚的泡沫支撑表面放置在受试者的脚下，以改变足底和脚踝处的体感信息的质量和/或数量。生物反馈的基本原理包括通过对舌头的电刺激提供关于头部相对于重力垂直方向的取向的补充信息。使用测力平台记录足底压力中心（CoP）位移。在无生物反馈和生物反馈两种条件下，泡沫条件下的CoP位移均大于硬质条件下的CoP位移。有趣的是，这种不稳定的影响是在生物反馈比无生物反馈条件下加重。根据平衡控制的感觉重新加权假设，本研究结果证明，中枢神经系统的可用性，以整合通过电刺激舌头传递的人工头部方向信息，以限制由来自支持表面的体感输入的改变引起的姿势扰动。
英文摘要：
The present study aimed at investigating the effects of an artificial head position-based tongue-placed electrotactile biofeedback on postural control during quiet standing under different somatosensory conditions from the support surface. Eight young healthy adults were asked to stand as immobile as possible with their eyes closed on two Firm and Foam support surface conditions executed in two conditions of No-biofeedback and Biofeedback. In the Foam condition, a 6-cm thick foam support surface was placed under the subjects' feet to alter the quality and/or quantity of somatosensory information at the plantar sole and the ankle. The underlying principle of the biofeedback consisted of providing supplementary information about the head orientation with respect to gravitational vertical through electrical stimulation of the tongue. Centre of foot pressure (CoP) displacements were recorded using a force platform. Larger CoP displacements were observed in the Foam than Firm conditions in the two conditions of No-biofeedback and Biofeedback. Interestingly, this destabilizing effect was less accentuated in the Biofeedback than No-biofeedback condition. In accordance with the sensory re-weighting hypothesis for balance control, the present findings evidence that the availability of the central nervous system to integrate an artificial head orientation information delivered through electrical stimulation of the tongue to limit the postural perturbation induced by alteration of somatosensory input from the support surface.
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