Effect of gravity on human spontaneous 10-Hz electroencephalographic oscillations during the arrest reaction
Effect of gravity on human spontaneous 10-Hz electroencephalographic oscillations during the arrest reaction
复制标题
DOI：
10.1016/j.brainres.2006.08.098
复制
发表时间：
2006-11-22
期刊：
影响因子：
2.9
通讯作者：
McIntyre, J.
中科院分区：
文献类型：
--
作者：
Cheron, G.;Leroy, A.;McIntyre, J.
在清醒、放松(闭眼)的受试者中观察到的最显著的节律是10赫兹的脑电振荡(α节律和MU节律)。这些振荡可被认为是大脑皮层不活动的标志或感觉信息主动抑制的指标。不同的皮层来源可能参与10-赫兹的振荡，并且似乎受到感觉环境和功能需求的调制。在微重力下，参与空间表征的大脑皮层网络的多模式重力感受性输入的显著减少可能会影响10赫兹的活动。到目前为止，还没有定量研究微重力对这一基本振荡的影响。由于阿尔法节律在调节视觉区域的网络属性中具有功能作用，我们假设重力的缺失会影响其强度。在这里，我们报告了一项在三次太空飞行过程中进行的实验结果，在该实验中，我们量化了10赫兹活动与停顿反应(即在两种不同的生理状态下：睁眼和闭眼)的能量。我们观察到在失重状态下，顶枕区(α节律)和感觉运动区(u节律)在闭眼状态下记录到的10赫兹自发振荡的功率增加。停滞反应过程中的抑制系数和由开/闭状态转变引起的光谱扰动也在轨道上增大。这些结果根据目前关于阿尔法节律的来源和对认知功能的重要性的理论进行了讨论。(C)2006爱思唯尔B.V.保留所有权利。
Electroencephalographic oscillations at 10Hz (alpha and mu rhythms) are the most prominent rhythms observed in awake, relaxed (eye-closed) subjects. These oscillations may be considered as a marker of cortical inactivity or an index of the active inhibition of the sensory information. Different cortical sources may participate in the 10-Hz oscillation and appear to be modulated by the sensory context and functional demands. in microgravity, the marked reduction in multimodal graviceptive inputs to cortical networks participating in the representation of space could be expected to affect the 10-Hz activity. The effect of microgravity on this basic oscillation has heretofore not been studied quantitatively. Because the alpha rhythm has a functional role in the regulation of network properties of the visual areas, we hypothesised that the absence of gravity would affect its strength. Here, we report the results of an experiment conducted over the course of 3 space flights, in which we quantified the power of the 10-Hz activity in relation to the arrest reaction (i.e., in 2 distinct physiological states: eyes open and eyes closed). We observed that the power of the spontaneous 10-Hz oscillation recorded in the eyes-closed state in the parieto-occipital (alpha rhythm) and sensorimotor areas (mu rhythm) increased in the absence of gravity. The suppression coefficient during the arrest reaction and the related spectral perturbations produced by eye-opening/closure state transition also increased in on orbit. These results are discussed in terms of current theories on the source and the importance of the alpha rhythm for cognitive function. (c) 2006 Elsevier B.V. All rights reserved.