IEEE Trans Biomed Eng. 2011 Aug;58(8). doi: 10.1109/TBME.2011.2158647. Epub 2011 Jun 7.
This pilot study investigates effects of an ultra shielded capsule at the low-noise underground laboratory (LSBB), Rustrel, France, when used to acquire scalp electroencephalogram (EEG). Analysis of EEG recordings from three volunteers confirms that clean EEG signals can be acquired in the LSBB capsule without the need for notch filtering. In addition, using different setups for acquiring EEG in the capsule, statistical analysis of power spectral densities based on a geodesic distance measure reveals that the laptop computer and patient module do not introduce any noise on recorded signals. Moreover, the current study shows that the backward counting task as a mental activity can be better detected using the EEG acquired in the capsule due to the higher level of â-band activities. The counting-relaxed â-band energy ratio is calculated using the S transform and compared between the hospital and capsule, revealing significantly higher values in the capsule (p < 0.05). Exploring the relative â-band energy (ratio of â-band energy to that of 0-12 Hz in counting state) reveals that the average of this measure is higher in the capsule for all subjects. Those results demonstrate the potential of the LSBB capsule for novel EEG studies, including establishing novel low-noise EEG benchmarks.
本初步研究调查了在法国 Rustrel 的低噪声地下实验室 (LSBB) 使用超屏蔽胶囊采集头皮脑电图 (EEG) 的效果。对三名志愿者的 EEG 记录进行分析，确认在不使用陷波滤波的情况下，可在 LSBB 胶囊内获取清洁的 EEG 信号。此外，通过在胶囊内使用不同的 EEG 采集设置，基于测地线距离度量的功率谱密度的统计分析表明，笔记本电脑和患者模块不会对记录的信号引入任何噪声。此外，本研究表明，由于 â 波段活动水平较高，使用胶囊内获取的 EEG 可以更好地检测到作为心理活动的倒计数任务。使用 S 变换计算计数-放松 â 波段能量比，并在医院和胶囊之间进行比较，结果显示胶囊内的数值显著更高 (p < 0.05)。探索相对 â 波段能量（计数状态下的 â 波段能量与 0-12 Hz 波段能量的比值）表明，对于所有受试者，该指标的平均值在胶囊内更高。这些结果表明 LSBB 胶囊在新型 EEG 研究中的潜力，包括建立新型低噪声 EEG 基准。
