Spectral structure and brain mapping of human alpha activities in different arousal states
Spectral structure and brain mapping of human alpha activities in different arousal states
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DOI：
10.1159/000026569
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发表时间：
1999-01-01
影响因子：
3.2
通讯作者：
Salas, RM
中科院分区：
文献类型：
--
作者：
Cantero, JL;Atienza, M;Salas, RM
在一项以年轻健康受试者为研究对象的研究中，研究了三种不同唤醒状态下的α活动：在放松清醒（EC）、睡意（DR）和快速眼动（REM）睡眠时闭上眼睛。将alpha波段分为慢、中、快三个细分，分别对每个状态进行分析。结果显示，受试者的生理状态不同，α波段的光谱组成也不同。慢α似乎独立于唤醒状态，而中α则显示出快速眼动和其他状态之间的差异。快速α细分主要表现为清醒时的脑电图成分，因为只有在清醒时才显示出增加的功率，而在DR和REM时则显示出较低且高度稳定的值。每个状态下的头皮α活动分布略有不同：在EC时，从枕部到中部区域，在DR时，这种地形延伸到额极区域，在REM睡眠时，从枕部到额叶区域有所贡献。这些结果为根据大脑觉醒状态的α功率调制和不同的头皮分布提供了证据。
In a study with in young, healthy subjects, alpha activities were studied in th ree different arousal states: eyes closed in relaxed wakefulness (EC), drowsiness (DR), and REM sleep. The alpha band was divided into th ree subdivisions (slow, middle, and fast) which were analyzed separately for each state. The results showed a different spectral composition of alpha band according to the physiological state of the subject. Slow alpha seemed to be independent of the arousal state, whereas middle alpha showed a difference between REM and the other states. The fast-alpha subdivision appears mainly as a waking EEG component because of the increased power displayed only in wakefulness and lower and highly stable values for DR and REM. Scalp distribution of alpha activity was slightly different in each state: from occipital to central regions in EC, this topography was extended to fronto-polar areas in DR, with a contribution from occipital to frontal regions in REM sleep. These results provide evidence for an alpha power modulation and a different scalp distribution according to the cerebral arousal state.