Mukhametov L M, Supin A Ia, Poliakova I G
Zh Vyssh Nerv Deiat Im I P Pavlova. 1984 Mar-Apr;34(2):259-64.
ECoG both hemispheres, EOG, neck EMG, ECG and electrical activity of olfactory bulbs were recorded in 4 free moving adult Caspean seals of both sexes. Their sleep on land and in water was compared. The wakefulness occupied 85,5 +/- 1,5% of total recording time, the slow wave sleep--12,8 +/- 1,4% and paradoxical sleep--1,7 +/- 0,2%. Unlike the dolphins, the Caspean seals possess no unihemispheric slow wave sleep. When the seals sleep on the land or on the water surface and do not change their posture for breathing they may breathe without awakening like the terrestrial mammals. But when the seals emerge or change their posture to get nostrils above the water they wake up briefly for respiration period.
在4只自由活动的成年里海海豹（雌雄均有）身上记录了双侧半球的脑电活动（ECoG）、眼电活动（EOG）、颈部肌电活动（EMG）、心电图（ECG）以及嗅球的电活动。对它们在陆地和水中的睡眠情况进行了比较。清醒状态占总记录时间的85.5±1.5%，慢波睡眠占12.8±1.4%，异相睡眠占1.7±0.2%。与海豚不同，里海海豹不存在单侧半球慢波睡眠。当海豹在陆地或水面睡眠且不改变呼吸姿势时，它们可以像陆生哺乳动物一样在不醒来的情况下呼吸。但当海豹浮出水面或改变姿势使鼻孔露出水面时，它们会在呼吸期间短暂醒来。
