Use of galvanic vestibular feedback for a balance prosthesis.
Use of galvanic vestibular feedback for a balance prosthesis.
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使用平衡假体的电流前庭反馈。
DOI：
10.1109/embc.2012.6347394
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
Peterka,RobertJ
中科院分区：
文献类型：
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作者：
Peterka,RobertJ
双侧双极电流前庭刺激 (GVS) 激活前庭传入神经，引起内侧-外侧 (ML) 身体摇摆。通过应用作为测量的 ML 头部运动函数的 GVS 反馈信号，GVS 有可能恢复对 GVS 保持响应的前庭缺陷受试者的 ML 平衡控制的有用前庭贡献。使用 GVS 开发有效平衡假体的关键是确定 GVS 及其对大脑内部头部运动估计的影响之间的功能关系。我们描述了如何使用基于模型的 GVS 诱发的身体摇摆解释来识别这种功能关系。结果表明，GVS 引起的内部运动估计实际上是 GVS 电流的低通滤波版本。通过初步数据，我们证明，对已识别的低通特性进行补偿的 GVS 反馈可以消除具有正常前庭功能的受试者使用前庭信息进行平衡控制的能力，或者可以恢复具有双侧前庭损失的受试者在需要前庭信息进行平衡控制的情况下保持平衡的能力。
Activation of vestibular afferents by a bilateral bipolar galvanic vestibular stimulus (GVS) evokes medial-lateral (ML) body sway. By applying a GVS feedback signal that is a function of measured ML head motion, the potential exists for GVS to restore a useful vestibular contribution to ML balance control in vestibular-deficient subjects who remain responsive to GVS. A key to developing an effective balance prosthesis using GVS is to determine the functional relationship between GVS and its influence on the brain's internal estimate of head motion. We describe how a model-based interpretation of GVS-evoked body sway can be used to identify this functional relationship. Results indicate that the GVS-evoked internal motion estimate is effectively a low-pass filtered version of the GVS current. With preliminary data, we demonstrate that GVS feedback, compensated for the identified low-pass characteristics, can either remove the ability of a subject with normal vestibular function to use vestibular information for balance control, or can restore the ability of a subject with bilateral vestibular loss to maintain balance in a condition requiring vestibular information for balance control.