Bjorvatn B, Fagerland S, Ursin R
Department of Physiology, University of Bergen, Norway.
Physiol Behav. 1998 Feb 1;63(3):413-7. doi: 10.1016/s0031-9384(97)00460-5.
Frontofrontal and frontoparietal EEG power densities (0.5-20 Hz) in waking, light and deep slow-wave sleep, transition-type sleep, and rapid-eye-movement (REM) sleep were investigated for 8 h during the light period in 16 male Wistar rats. The data indicate that as delta activity (0.5-4.5 Hz) increased from light to deep slow-wave sleep, the number of epochs per scoring epoch with high sigma activity (11-16 Hz) as well as power densities in the rest of the spectrum (5-20 Hz) including sigma frequencies also increased. This is in parallel with other rat studies but contrasts findings in humans, where EEG sigma activity is reported to decrease as sleep deepens. During the 8-h recording period, delta activity decreased whereas sigma activity increased.
在16只雄性Wistar大鼠的光照期对其进行了8小时的研究，测量了它们在清醒、浅睡眠、深慢波睡眠、过渡型睡眠和快速眼动（REM）睡眠状态下额额和额顶脑电图功率密度（0.5 - 20赫兹）。数据表明，随着δ活动（0.5 - 4.5赫兹）从浅睡眠增加到深慢波睡眠，每个评分时段中高σ活动（11 - 16赫兹）的时段数量以及包括σ频率在内的频谱其余部分（5 - 20赫兹）的功率密度也增加。这与其他大鼠研究结果一致，但与人类研究结果相反，据报道人类脑电图的σ活动会随着睡眠加深而降低。在8小时的记录期内，δ活动减少而σ活动增加。
