Electroencephalographic Correlates of Continuous Postural Tasks of Increasing Difficulty
Electroencephalographic Correlates of Continuous Postural Tasks of Increasing Difficulty
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DOI：
10.1016/j.neuroscience.2018.10.040
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发表时间：
2018-12-15
期刊：
影响因子：
3.3
通讯作者：
Bronstein, Adolfo M.
中科院分区：
文献类型：
--
作者：
Edwards, Amy E.;Guven, Onur;Bronstein, Adolfo M.
皮层参与姿势控制是公认的，然而非视觉传入的作用仍不清楚。顶叶皮质区与前庭空间功能密切相关，但在平衡任务中的地形定位仍然有限。在这里，我们使用脑电图（EEG）在单个电极位置增加难度的连续平衡任务。24名健康的右撇子受试者在闭着眼睛的情况下完成了四项难度增加的平衡任务（两足和单足）和坐姿控制条件。获得任务难度的主观评分。记录32个电极的脑电图；选择5个重叠的感觉和运动感兴趣区（roi）进行进一步研究：C3， Cz, C4, P3, P4。在theta （4-8 Hz）和alpha （8-12 Hz）波段分析平衡任务时的频谱功率和相干性。阿尔法能力随着任务难度的增加而降低，这种降低与主观难度评级有关。C3-Cz-C4电极对之间的α相干性随任务难度的增加而增加。在Cz观察到功率的差异变化，表明该电极位置具有独特的作用，该电极位置捕获下肢皮层表征。观察到大脑半球不对称，反映在右侧区域的θ和α能量更大的减少。我们的结果证明了双侧中央和顶叶皮质在持续平衡控制中的功能重要性。观察到的半球不对称表明，非优势半球参与了姿势控制的在线监测。尽管发现的后顶叶不对称可能与前庭、体感或多感觉反馈处理有关，但我们认为这一发现与主动平衡控制有关，而不是简单的感觉摄取或反射回路激活。(C) 2018年作者。由Elsevier Ltd代表IBRO出版。
Cortical involvement in postural control is well recognized, however the role of non-visual afferents remains unclear. Parietal cortical areas are strongly implicated in vestibulo-spatial functions, but topographical localization during balance tasks remains limited. Here, we use electroencephalography (EEG) during continuous balance tasks of increasing difficulty at single electrode positions. Twenty-four healthy, right-handed individuals performed four balance tasks of increasing difficulty (bipedal and unipedal) and a seated control condition with eyes closed. Subjective ratings of task difficulty were obtained. EEG was recorded from 32 electrodes; 5 overlying sensory and motor regions of interest (ROIs) were chosen for further investigation: C3, Cz, C4, P3, P4. Spectral power and coherence during balance tasks were analyzed in theta (4-8 Hz) and alpha (8-12 Hz) bands. Alpha power reduced as task difficulty increased and this reduction correlated with subjective difficulty ratings. Alpha coherence increased with task difficulty between C3-Cz-C4 electrode pairs. Differential changes in power were observed in Cz, suggestive of a distinct role at this electrode location, which captures lower limb cortical representation. Hemispheric asymmetry was observed, as reflected by greater reductions in theta and alpha power in right-sided areas. Our results demonstrate the functional importance of bilateral central and parietal cortices in continuous balance control. The hemispheric asymmetry observed implies that the non-dominant hemisphere is involved with online monitoring of postural control. Although the posterior parietal asymmetry found may relate to vestibular, somatosensory or multisensory feedback processing, we argue that the finding relates to active balance control rather than simple sensory-intake or reflex circuit activation. (C) 2018 The Authors. Published by Elsevier Ltd on behalf of IBRO.