Abstract
An attempt was made to elicit sleep by electrical stimulation in various parts of the cat's brain. Negative square pulses of intensities, subliminal with respect to the threshold of other clearly visible motor or autonomic effects, were used. The behavior was observed, coded and correlated with the EEG. The results of stimulations were compared statistically with behavior during sham experiments. The control experiments were necessary because all the animals showed a tendency to fall asleep in the identical experimental situation without stimulation. The differences in the latencies of the sleep effects were significant. Sleep effects were elicited in all the stimulated brain structures: cerebellum, hippocampus, amygdaloid, visual and motor cortex. Sleep effects of some of these structures have not been described in the literature. The initial behavioral states before the experiments were significantly related to the frequency and latency of sleep effects. After discussing the possibilities and limitations of the experiments we conclude that the subliminal stimulation produces statistically significant sleep effects.
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