Abstract
In response to single electrical stimulation of the caudate nucleus of unanesthetized, freely moving cats, an evoked potential arises more easily in the sensomotor cortex than in the hippocampus. Despite this fact, hippocampal evoked potentials are facilitated and stabilized at a frequency of 4–6/sec. In the sensomotor cortex, on the other hand, the potentials are most marked at a frequency of 6–8/sec, but they are variable and during prolonged stimulation spindle-like activity is formed. The behavioral correlate of synchronization of electrical activity during low-frequency stimulation of the caudate nucleus is a drowsy state, which ceases at the end of stimulation. Similar stimulation in the paradoxical phase of sleep also evokes synchronization of the electrocorticogram, but after stimulation the structure of the paradoxical phase is restored. Synchronizing stimulation of the caudate nucleus causes considerable changes in the waking-sleep cycle in the poststimulation period: The total amount of the slow-wave phase is reduced and that of the paradoxical phase is increased.
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