Sleep Circadian Rhythms in the Rat: One or Two Clocks?
Even though it is obvious that a period of inactivity may correspond with completely different processes, e.g., quiet wakefulness, Slow Wave Sleep (SWS), Paradoxical Sleep (PS) of focused attention, most of the studies on circadian rhythms are based only on the pattern of activity of experimental animals and the epochs of inactivity are looked upon as a negative state. Moreover, in these experiments, the withdrawal and/or changing of the known Zeitgebers is quite often the most commonly used procedure.
KeywordsCircadian Rhythm Sleep Stage Raphe Nucleus Slow Wave Sleep Nucleus Raphe Dorsalis
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