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首页> 外文期刊>Progress in brain research >A multisensory posture control model of human upright stance.
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A multisensory posture control model of human upright stance.

机译：人体直立姿势的多感觉姿势控制模型。

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摘要

We present a multisensory postural control model based on experiments where the balance in normal subjects and vestibular loss patients was perturbed by application of external torque produced by force-controlled pull stimuli. The stimuli were applied while subjects stood on a stationary or body-sway-referenced motion platform with eyes closed and auditory cues masked. Excursions of the center of mass (COM) and the center of pressure (COP) were analyzed using a systems analysis approach. The results were compared to an 'inverted pendulum' model of posture control. The model receives input from four sensors: ankle proprioceptors, semicircular canals, otoliths, and plantar pressure sensors (somatosensory graviceptors). Sensor fusion mechanisms are used to yield separate internal representations of foot support motion, gravity, and external torque (pull). These representations are fed as global set point signals into a local control loop based on ankle proprioceptive negative feedback. This set point control upgrades the proprioceptive body-on-foot (support) stabilization into a body-in-space control which compensates for support tilt, gravity, and contact forces. This compensation occurs even when the stimuli are combined or a voluntary lean is superimposed. Model simulations paralleled our experimental findings.
机译：我们提出了一个基于实验的多感觉姿势控制模型，通过施加力控制拉动刺激产生的外部扭矩来扰乱正常受试者和前庭损失患者的平衡。当受试者站在静止或以身体为参照的运动平台上，闭上眼睛并遮盖听觉提示时，施加刺激。使用系统分析方法分析质心（COM）和压力中心（COP）的偏移。将结果与姿势控制的“倒立摆”模型进行比较。该模型接收来自四个传感器的输入：脚踝本体感受器，半圆管，耳石和足底压力传感器（体感重力感受器）。传感器融合机制用于产生脚支撑运动，重力和外部扭矩（拉力）的独立内部表示。这些表示作为全局设定点信号被输入到基于脚踝本体感受性负反馈的局部控制回路中。此设定点控制将本体感觉脚上的支撑（支撑）稳定性升级为空间人体控制，可补偿支撑倾斜，重力和接触力。即使将刺激组合在一起或叠加自愿瘦身，也会发生这种补偿。模型模拟与我们的实验结果一致。

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