Abstract
Electrical activity of the olfactory bulb, olfactory tubercle, amygdala, hippocampus, hypothalamus, and neocortex in the various phases of natural sleep was studied in chronic experiments on dogs under conditions close to those of free behavior. During paradoxical sleep it was found that a high-frequency synchronized rhythm of sinusoidal waves with a frequency of 36–42 Hz arises in the olfactory structures and amygdala. Generation of this activity during paradoxical sleep, by contrast with wakefulness, was unconnected with stimulation of the olfactory receptors and was probably purely central in origin. A study of the dynamics of the olfacto-amygdaloid rhythm during the paradoxical phase, and its comparison with somatic, autonomic, and EEG correlates of sleep, led to the conclusion that this rhythm is a specific EEG correlate of the paradoxical phase of sleep in dogs.
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