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Electrophysiological investigation of natural sleep and waking in turtles and hens

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Abstract

A comparative electrophysiological study of the stages of sleep and waking was undertaken on the pond turtleEmys orbicularis, and White Leghorn hens. This study involved temporal, spectral and correlation analyses of the electroencephalogram (EEG). Duration, intensity and periodicity of EEG proved to be sensitive indicators of the stages of natural sleep and waking.

The EEG of reptiles in an active waking state differs considerably from the desynchronized EEG of hens in the same state. The reptilian EEG is dominated by low-frequency components below 3–4/sec which create the picture of synchronization. The EEG of pond turtles during sleep shows certain features of the telencephalic stage of sleep in hens. The paradoxical stage of sleep is absent in pond turtles. In the EEG of hens the intensity of the low-frequency waves (3–7/sec) is increased and the telencephalic and paradoxical stages of sleep are evident.

Passive waking in pond turtles and cataleptic sleep in hens have similar behavioral and electroencephalographic manifestations. These sleep-like states are regarded as primitive, initial forms of sleep (archihypnos). The primitive hypothalamo-hemispheric integration system plays an important role in the manifestation of these states.

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Authors and Affiliations

  1. Sechenov Institute of Evolutionary Physiology and Biochemistry, USSR Academy of Sciences, Leningrad

    I. G. Karmanova & E. V. Churnosov

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  1. I. G. Karmanova
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  2. E. V. Churnosov
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Karmanova, I.G., Churnosov, E.V. Electrophysiological investigation of natural sleep and waking in turtles and hens. Neurosci Behav Physiol 6, 83–90 (1973). https://doi.org/10.1007/BF01186007

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