Flinders Health and Medical Research Institute: Sleep Health, Flinders University, Adelaide, South Australia, Australia.
College of Education, Psychology and Social Work, Flinders University, Adelaide, South Australia, Australia.
J Sleep Res. 2024 Dec;33(6):e14203. doi: 10.1111/jsr.14203. Epub 2024 Mar 27.
By design, tripolar concentric ring electrodes (TCRE) provide more focal brain activity signals than conventional electroencephalography (EEG) electrodes placed further apart. This study compared spectral characteristics and rates of data loss to noisy epochs with TCRE versus conventional EEG signals recorded during sleep. A total of 20 healthy sleepers (12 females; mean [standard deviation] age 27.8 [9.6] years) underwent a 9-h sleep study. Participants were set up for polysomnography recording with TCRE to assess brain activity from 18 sites and conventional electrodes for EEG, eyes, and muscle movement. A fast Fourier transform using multitaper-based estimation was applied in 5-s epochs to scored sleep. Odds ratios with Bonferroni-adjusted 95% confidence intervals were calculated to determine the proportional differences in the number of noisy epochs between electrode types. Relative power was compared in frequency bands throughout sleep. Linear mixed models showed significant main effects of signal type (p < 0.001) and sleep stage (p < 0.001) on relative spectral power in each power band, with lower relative spectral power across all stages in TCRE versus EEG in alpha, beta, sigma, and theta activity, and greater delta power in all stages. Scalp topography plots showed distinct beta activation in the right parietal lobe with TCRE versus EEG. EEG showed higher rates of noisy epochs compared to TCRE (1.3% versus 0.8%, p < 0.001). TCRE signals showed marked differences in brain activity compared to EEG, consistent with more focal measurements and region-specific differences during sleep. TCRE may be useful for evaluating regional differences in brain activity with reduced muscle artefact compared to conventional EEG.
设计上，三极同心环电极（TCRE）比放置相隔更远的常规脑电图（EEG）电极提供更多的焦点脑活动信号。本研究比较了 TCRE 与常规 EEG 信号在睡眠期间记录的光谱特征和受噪 epoch 数据丢失率。共有 20 名健康睡眠者（12 名女性；平均[标准差]年龄 27.8[9.6]岁）接受了 9 小时的睡眠研究。参与者被设置为 TCRE 进行多导睡眠图记录，以评估 18 个部位的脑活动，以及常规电极进行脑电图、眼睛和肌肉运动。使用基于多窗谱估计的快速傅里叶变换应用于评分睡眠的 5 秒 epoch。使用 Bonferroni 调整的 95%置信区间计算比值比，以确定电极类型之间受噪 epoch 数量的比例差异。在整个睡眠过程中比较了相对功率在频带中的差异。线性混合模型显示信号类型（p<0.001）和睡眠阶段（p<0.001）对每个频带相对谱功率有显著的主效应，在 TCRE 与 EEG 的所有阶段中，相对谱功率都较低，在 alpha、beta、sigma 和 theta 活动中，在 delta 功率中更大。头皮地形图显示 TCRE 与 EEG 相比，右侧顶叶有明显的 beta 激活。与 TCRE 相比，EEG 显示出更高的受噪 epoch 率（1.3%比 0.8%，p<0.001）。与 EEG 相比，TCRE 信号显示出明显不同的脑活动，这与睡眠期间更集中的测量和特定区域的差异一致。与常规 EEG 相比，TCRE 可能有助于评估脑活动的区域差异，并且肌肉伪影减少。
