Abstract
Electrical activity was recorded from the dorso-medial hippocampus in freely moving rats via chronically implanted bipolar electrodes. Observations are reported on the occurence of hippocampal theta rhythm, and changes in its frequency, amplitude and regularity, during exploratory behaviour, vibrissal movement, drinking, grooming and fearful crouching. Lesions were produced in the medial septal area electrolytically via a second chronically implanted electrode while the animal was freely moving. Data are reported on the resulting disruption of hippocampal theta rhythm for periods of up to 7 weeks after the lesion. In some cases disruption of normal bilaterally synchronous and temporally regular vibrissal movement also resulted from the lesion, but this effect and the disturbance in theta rhythm were dissociable.
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