Frequency changes in hippocampal electrical activity during movement and tonic immobility.

Abstract Electroencephalographic activity of the hippocampus was recorded from unanesthetized rabbits during periods of movement, non-movement, sleep and tonic immobility. Hippocampal rhythmic slow activity (RSA) was present in all these states, even in quiet sleep. RSA was slower during non-movement than movement periods, increased in frequency during phasic periods of active sleep, and was identical in tonic immobility periods to non-movement periods. Harmonics of the base frequency of RSA were present during active sleep.

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