Fatigue assessment by electroencephalogram measured with candle-like dry microneedle electrodes
Fatigue assessment by electroencephalogram measured with candle-like dry microneedle electrodes
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DOI：
10.1049/mnl.2017.0098
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发表时间：
2017-08-01
影响因子：
1.3
通讯作者：
Miki, Norihisa
中科院分区：
文献类型：
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作者：
Kudo, Yuta;Arai, Miyako;Miki, Norihisa
这项工作报告了脑电图（EEG）指数的创建和与实验发现与人类精神疲劳高度相关的α波段频率（8-13 Hz）相关的功率比的发现。利用微加工的蜡烛状微针电极（CME），避开毛发，穿透高阻抗的角质层，在人的枕叶进行脑电测量。新确定的EEG指数表现出更高的相关性，精神疲劳状态，这是主观评定通过视觉模拟量表（VAS），比心率变异，这是经常使用的疲劳水平的客观措施。有趣的是，发现指数趋势在VAS发生变化前10分钟发生变化，这意味着该指数甚至可以在受试者自己意识到之前评估精神疲劳的发作。该EEG指数的识别，沿着通过CME容易地获得EEG测量，这是由于CME不需要任何皮肤准备或导电凝胶并且可以从头皮的毛发覆盖部分获取EEG的事实，可以预期促进使用EEG的实际疲劳评估应用。
This work reports on the creation of an electroencephalogram (EEG) index and the discovery of a power ratio related to alpha band frequencies (8-13 Hz) that were experimentally found to have a high correlation with human mental fatigue. The EEG was measured from occipital lobe of the human brain by microfabricated dry candle-like microneedle electrodes (CMEs) that can avoid hairs and penetrate through the high-impedance stratum corneum. The newly identified EEG index exhibited higher correlations to mental fatigue states, which were rated subjectively via the visual analogue scale (VAS), than did heart rate variance, which is often used as the objective measure of fatigue levels. Interestingly, it was found that the index trend changed 10 min before the VAS did, which implies that the index could assess the onset of mental fatigue even before the subjects recognised it themselves. The identification of this EEG index, along with the ease of obtaining EEG measurements via CME, which is due to the fact that the CME does not require any skin preparation or conductive gels and can acquire EEGs from hair-covered parts of the scalp, can be expected to promote practical fatigue assessment applications that use EEGs.