The influence of sensory information on two-component coordination during quiet stance
The influence of sensory information on two-component coordination during quiet stance
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DOI：
10.1016/j.gaitpost.2006.09.007
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发表时间：
2007-07-01
期刊：
影响因子：
2.4
通讯作者：
Jeka, John
中科院分区：
文献类型：
--
作者：
Zhang, Yuanfen;Kiemel, Tim;Jeka, John
当安静地站立时，人的直立姿势通常近似为单段倒立摆。相比之下，研究，扰乱直立的立场与支持，表面平移或视觉驱动刺激表明，身体的行为就像一个两段的钟摆，显示两个相位和反相位模式之间的上部和下部的身体。我们最近表明，这些模式共存于安静的立场;在相位和反相位的频率低于和高于1赫兹，分别。在这里，我们调查了这些基本模式的特征是否受到感官信息的添加或去除的影响，10名健康的年轻受试者直立在刚性平台上，具有不同的感官信息组合：眼睛睁开或关闭，有或没有轻微的触摸接触（< 1 N）的右食指指尖与直径5 cm的刚性力板。在前后（AP）和内外（ML）两个摇摆方向上同时存在同相和反相模式。躯干-腿复合相干性的真实的部分随着视觉和轻触的增加而降低，对应于在较低频率下从同相到反相模式的过渡。在AP方向上，仅在频率低于1 Hz时观察到减少，其中同相模式占主导地位。额外的感官信息没有明显的影响，在摇摆频率高于1赫兹，其中反相模式占主导地位。这两种模式显然是一个双链接倒立摆动力学的结果，但同相模式的连贯性更容易受到调制的感官信息比反相模式。(c)2006 Elsevier B. V.保留所有权利。
When standing quietly, human upright stance is typically approximated as a single segment inverted pendulum. In contrast, investigations, which perturb upright stance with support, surface translations or visual driving stimuli have shown that the body behaves like a two-segment pendulum, displaying both in-phase and anti-phase patterns between the upper and lower body. We have recently shown that these patterns coexist during quiet stance; in-phase and anti-phase for frequencies below and above 1 Hz, respectively. Here we investigated whether the characteristics of these basic patterns were influenced by the addition or removal of sensory information.Ten healthy young subjects stood upright on a rigid platform with different combinations of sensory information: eyes were open or closed with or without light touch contact (< 1 N) of the right index fingertip with a 5 cm diameter rigid force plate. The in-phase and anti-phase pattern co-exist in both the anterior-posterior (AP) and medial-lateral (ML) directions of sway. The real part of trunk-leg complex coherence decreased with the addition of vision and light touch, corresponding to a transition from the in-phase to anti-phase pattern at a lower frequency. In the AP direction, the decrease was only observed at frequencies below 1 Hz where the in-phase pattern predominates. Additional sensory information had no observable effect at sway frequencies above 1 Hz, where the anti-phase pattern predominates. Both patterns are clearly the result of a double-linked inverted pendulum dynamics, but the coherence of the in-phase pattern is more susceptible to modulation by sensory information than the anti-phase pattern. (c) 2006 Elsevier B.V. All rights reserved.