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  • Title: Hippocampal EEG theta power density is similar during slow-wave sleep and paradoxical sleep. A long-term study in rats.
    Author: Gaztelu JM, Romero-Vives M, Abraira V, Garcia-Austt E.
    Journal: Neurosci Lett; 1994 May 19; 172(1-2):31-4. PubMed ID: 8084533.
    Abstract:
    Rat hippocampal EEG and motor activity were studied during 15 days in relation to the vigilance state and to the light-dark cycle with a computerized system. During slow-wave sleep (SS) the hippocampal EEG has an outstanding mean power density in the theta band, similar to the large values present during paradoxical sleep. A circadian modulation was found for motor activity in SS and wakefulness (i.e. day-sleep is more restless, day-wakefulness is more quiet than night), and for EEG mean theta power in SS (i.e. less during day-sleep than night-sleep). These data underline the importance of analyzing the dark period when studying nocturnal animals.
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