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Spectral analysis of hippocampal electroencephalography in the freely moving rat effects of centrally active drugs and relations to evoked potentials

, : Spectral analysis of hippocampal electroencephalography in the freely moving rat effects of centrally active drugs and relations to evoked potentials. Electroencephalography & Clinical Neurophysiology 60(1): 65-77

Hippocampal EEG signals derived from chronically implanted electrodes in the freely moving rat were recorded before and after administration of centrally acting drugs, and analyzed by power and coherence spectra. Eserine, ether or urethane induced a low frequency (3-6 c[cycles]/s) .theta. power and coherence peak in the immobile rat, which was sensitive to atropine or scopolamine. After phencyclidine, .theta. that occurred during walking (7-8 c/s) was virtually abolished by atropine while in the normal rat, absolute .theta. power was not affected by atropine. The residue spectrum, defined as the EEG spectrum with the .theta. harmonics removed, was sensitive to centrally acting drugs. Ether, urethane and pentobarbital suppressed fast waves of 50-100 c/s and under some conditions, enhanced 15-50 c/s waves. Eserine enhanced (30-60 c/s) fast waves during walking while atropine suppressed fast waves and increased irregular slow activity (< 30 c/s). The main effects of drugs and behavior on the residue spectra and on the average evoked potentials following stimulation of the Schaffer collaterals could be explained by a previously proposed model which suggests a continuum of hippocampal activation (tonic input) under the various conditions.

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