Tonic, phasic, and transient EEG correlates of auditory awareness in drowsiness
Tonic, phasic, and transient EEG correlates of auditory awareness in drowsiness
复制标题
DOI：
10.1016/0926-6410(95)00042-9
复制
发表时间：
1996-07-01
期刊：
影响因子：
--
通讯作者：
Jung, TP
中科院分区：
文献类型：
--
作者：
Makeig, S;Jung, TP
在睡意期间，人类对高于阈值的听觉目标的反应在4分钟或更长时间内往往会发生不规则的变化。这些表现波动伴随着三个时间尺度上脑电图（EEG）频谱的明显变化：(1)在分钟尺度和更长的间歇反应期间，（< 4赫兹）δ和（4-6赫兹）θ波段的平均活动水平以及睡眠纺锤波频率（14赫兹）高于警觉表现期间。(2)大多数被试在未检测到的目标出现前约10 s， 4-6 Hz的θ脑电图活动开始增加，35 Hz以上的伽马带活动开始减少，而在检测到的目标出现前，4-6 Hz幅度减少，伽马带幅度增加。这两种振幅差异持续15-20秒，并与目标检测概率中的事件相关周期并行发生。在同一时期，α和睡眠纺锤波频率幅值也显示出突出的15- 20a周期，但这些周期并不与表现周期相锁定。(3)在未检测到目标后1秒或更长的时间内，中间（10-25 Hz）频率的幅度会短暂下降，而在相同的潜伏期和频率范围内，检测到的目标之后会出现短暂的幅度上升。
During drowsiness, human performance in responding to above-threshold auditory targets tends to vary irregularly over periods of 4 min and longer. These performance fluctuations are accompanied by distinct changes in the frequency spectrum of the electroencephalogram (EEG) on three time scales: (1) during minute-scale and longer periods of intermittent responding, mean activity levels in the (< 4 Hz) delta and (4-6 Hz) theta bands, and at the sleep spindle frequency (14 Hz) are higher than during alert performance. (2) In most subjects, 4-6 Hz theta EEG activity begins to increase, and gamma band activity above 35 Hz begins to decrease, about 10 s before presentations of undetected targets, while before detected targets, 4-6 Hz amplitude decreases and gamma band amplitude increases. Both these amplitude differences last 15-20 s and occur in parallel with event-related cycles in target detection probability. In the same periods, alpha and sleep-spindle frequency amplitudes also show prominent 15-20 a cycles, but these are not phase locked to performance cycles. (3) A second or longer after undetected targets, amplitude at intermediate (10-25 Hz) frequencies decreases briefly, while detected targets are followed by a transient amplitude increase in the same latency and frequency range.