The boundary between wakefulness and steep: Quantitative electroencephalographic changes during the sleep onset period
The boundary between wakefulness and steep: Quantitative electroencephalographic changes during the sleep onset period
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DOI：
10.1016/s0306-4522(01)00309-8
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发表时间：
2001-01-01
期刊：
影响因子：
3.3
通讯作者：
Bertini, M
中科院分区：
文献类型：
--
作者：
De Gennaro, L;Ferrara, M;Bertini, M
通过比较两种睡眠开始的定义：第一阶段和第二阶段的首次发生，研究了清醒-睡眠过渡期间的微结构脑电图变化。在26名正常受试者的睡眠记录中，以1 hz的bin分辨率计算1-28 hz频率范围内的功率值。在平均个体时间序列后评估定量变化，与第1阶段或第2阶段的首次发生一致。单hz活动的时间过程显示，在第一阶段过渡期间，1-6 hz范围内功率呈线性增加，9-12 hz和16-28 hz范围内功率呈线性下降。在第2阶段过渡期间，脑电图功率在1-7和14-15 hz范围内呈线性增加，在18-28 hz范围内呈线性下降，而在8-12 hz范围内呈二阶多项式曲线。我们还比较了两个“开关”点区分清醒和睡眠的能力：在9-11-Hz和20-28-Hz组中，第一阶段发作后平均功率较低，在1-5-Hz组中平均功率较高，而在2阶段发作后，在1-8-Hz和12-16-Hz组中平均功率较高，在18-28-Hz组中平均功率较低。三个脑电图频率范围[δ / θ / σ(1-7和12-16 Hz)]的时间过程；β (17- 28hz)；alpha (8-11 Hz)]，在主成分分析的基础上分组，对前两个范围拟合一阶多项式曲线，对最后一个范围拟合二阶多项式曲线。在清醒状态下逐渐减少，在第一阶段达到最低点，随后在第二阶段增加。在第二阶段，1- 16hz频率范围内均匀增加的脑电图功率和第一阶段阿尔法功率的功能意义的转移指向第二阶段的开始，作为清醒和睡眠之间更可靠的边界。(c) 2001年。Elsevier Science Ltd.出版。版权所有。
Microstructural electroencephalographic changes during the wake fulness-sleep transition have been investigated by comparing two definitions of sleep onset: the first occurrence of stage 1 and of stage 2. Power values were calculated across a 1-28-Hz frequency range in a 1-Hz bin resolution in the sleep recordings of 26 normal subjects. Quantitative changes were assessed after averaging individual time series, aligned with respect to the first occurrence of stage 1 or of stage 2.The time course of the single-Hz activity revealed a linear increase of power in the 1-6-Hz range and a linear decrease in the 9-12- and 16-28-Hz ranges during the stage 1 transition. During the stage 2 transition, electroencephalogram power linearly increased in the 1-7- and 14-15-Hz ranges and decreased in the 18-28-Hz range, while the 8-12-Hz range fitted a second-order polynomial curve. The two 'switch' points were also compared in their ability to differentiate Hz by Hz wakefulness from sleep: a lower mean power was found after stage 1 onset in the 9-11-Hz and 20-28-Hz bins and a higher one in the 1-5-Hz bins, while a higher power was found in the 1-8-Hz and 12-16-Hz bins and a lower one in 18-28-Hz bins after stage 2 onset. The time course of three electroencephalographic frequency ranges [delta/theta/sigma (1-7 and 12-16 Hz); beta (17-28 Hz); alpha (8-11 Hz)], grouped on the basis of a principal component analysis, fitted a first-order polynomial curve for the first two ranges, and a second-order polynomial curve for the last. with a progressive decrease curing wakefulness, a minimum point during stage 1, and a subsequent increase during stage 2.The uniformly increasing electroencephalographic power across the 1-16-Hz frequency range during stage 2 and the shift of functional meaning for the alpha power during stage 1 point to the start of stage 2 as a more reliable boundary between wakefulness and sleep. (C) 2001 IBRO. Published by Elsevier Science Ltd. All rights reserved.