Controlling human upright posture: Velocity information is more accurate than position or acceleration
Controlling human upright posture: Velocity information is more accurate than position or acceleration
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DOI：
10.1152/jn.00983.2003
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发表时间：
2004-10-01
影响因子：
2.5
通讯作者：
Peterka, R
中科院分区：
文献类型：
--
作者：
Jeka, J;Kiemel, T;Peterka, R
神经系统如何融合来自多个模式的感觉信息以进行直立姿势控制的问题在很大程度上仍然没有解决。众所周知，视觉、前庭和体感通道提供位置和速率(例如，速度、加速度)信息来估计身体动力学。然而，目前尚不清楚当多感官信息融合时，是否有任何特定的属性起主导作用。我们最近对安静站立时的姿势摆动进行的随机分析表明，感官输入提供的关于身体速度的信息比身体的位置或加速度更准确。在这里，我们通过移除/衰减视觉和本体感觉中的感觉信息来降低速度信息的主要来源，以检验这一预测。姿势摆动的实验测量与模型预测进行了比较，以确定摆动行为是否表明速度信息而不是位置或加速度信息的缺陷。受试者闭着眼睛站在1)固定的、2)泡沫的或3)摇摆参考的支撑面上。表征姿势摇摆随机结构的六个指标的表现方式与退化速度信息的模型预测一致。结果与仅降低位置或加速度信息的效果不一致。这些发现支持这样一种假设，即速度信息是在安静站立时用于稳定姿势的最准确的感觉信息形式。我们的结果与这样的假设是一致的，即通常使用的实验操作(例如，泡沫、摇摆参考、闭眼)导致的摇摆行为的变化主要归因于丢失准确的速度信息。
The problem of how the nervous system fuses sensory information from multiple modalities for upright stance control remains largely unsolved. It is well established that the visual, vestibular, and somatosensory modalities provide position and rate (e.g., velocity, acceleration) information for estimation of body dynamics. However, it is unknown whether any particular property dominates when multisensory information is fused. Our recent stochastic analysis of postural sway during quiet stance suggested that sensory input provides more accurate information about the body's velocity than its position or acceleration. Here we tested this prediction by degrading major sources of velocity information through removal/attenuation of sensory information from vision and proprioception. Experimental measures of postural sway were compared with model predictions to determine whether sway behavior was indicative of a deficit in velocity information rather than position or acceleration information. Subjects stood with eyes closed on a support surface that was 1) fixed, 2) foam, or 3) sway-referenced. Six measures characterizing the stochastic structure of postural sway behaved in a manner consistent with model predictions of degraded velocity information. Results were inconsistent with the effect of degrading only position or acceleration information. These findings support the hypothesis that velocity information is the most accurate form of sensory information used to stabilize posture during quiet stance. Our results are consistent with the assumption that changes in sway behavior resulting from commonly used experimental manipulations (e.g., foam, sway-referencing, eyes closed) are primarily attributed to loss of accurate velocity information.