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首页> 外文期刊>Frontiers in Human Neuroscience >Posture Used in fMRI-PET Elicits Reduced Cortical Activity and Altered Hemispheric Asymmetry with Respect to Sitting Position: An EEG Resting State Study
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Posture Used in fMRI-PET Elicits Reduced Cortical Activity and Altered Hemispheric Asymmetry with Respect to Sitting Position: An EEG Resting State Study

机译：FMRI-PET引发的姿势降低了皮质活动，并相对于坐姿改变了半球不对称：脑电图休息状态研究

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Horizontal body position is a posture typically adopted for sleeping or during brain imaging recording in both neuroscience experiments and diagnostic situations. Recent literature showed how this position and similar ones with head down are associated to reduced plasticity, impaired pain and emotional responses. The present study aimed at further understanding the decrease of cortical activity associated with horizontal body position by measuring high-frequency EEG bands – typically associated with high-level cognitive activation – in a resting state experimental condition. To this end, two groups of 16 female students were randomly assigned to either sitting control (SC) or 2-h horizontal Bed Rest condition (hBR) while EEG was recorded from 38 scalp recording sites. The hBR group underwent several body transitions, from sitting to supine, and from supine to sitting. Results revealed a clear effect of horizontal posture: the hBR group showed, compared to its baseline and to SC, reduced High-Beta and Gamma EEG band amplitudes throughout the 2-h of hBR condition. In addition, before and after the supine condition, hBR group as well as SC exhibited a greater left vs. right frontal activation in both EEG bands while, on the contrary, the supine position induced a bilateral and reduced activation in hBR participants. The cortical sources significantly more active in SC compared with hBR participants included the left Inferior Frontal Gyrus and left Insula. Results are discussed in relation to the differences among neuroimaging methods (e.g., fMRI, EEG, NIRS), which can be partially explained by posture-induced neural network changes.
机译：水平体位置是通常用于睡觉或在神经科学实验和诊断情况下脑成像记录期间采用的姿势。最近的文献表明，这种立场和与头部相似的位置与降低的可塑性，痛苦和情绪反应有关。本研究旨在通过测量高频EEG带 - 通常与高水平认知激活相关 - 在静息状态实验条件下，进一步了解与水平体位相关的皮质活动的减少。为此，两组16名女学生随机分配到坐控制（SC）或2-H水平卧床休息条件（HBR），而EEG被从38个头皮记录网站记录。 HBR组接受了几个身体过渡，坐到仰卧，从仰卧到坐着。结果表明，水平姿势的明显效果：与其基线和SC，降低了在HBr条件的2-H中的高β和γ脑电图带振振的HBR组。此外，在仰卧状况之前和之后，HBR组以及SC在两个EEG带中呈现更大的左前方激活，同时，相反，仰卧位诱导HBR参与者的双侧和降低的活化。与HBR参与者相比，皮质源在SC中明显更活跃，包括左下方回到和左侧insula。结果是关于神经影像方法（例如，FMRI，EEG，NIR）的差异的讨论，其可以通过姿势引起的神经网络变化部分解释。

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