Variations in After-Discharge from the Hippocampus

Conclusions The after-discharge of the hippocampus is formed by a number of components which can combine to form several fairly discrete well organized patterns. These patterns seem to be related more to the state of the organism at the moment the after-discharge is produced than to the precise anatomic location of the electrodes or to the parameters of stimulation. Although the activity emanating from symmetrical electrode placements may show differences in pattern, there are systematic relationships between the right and the left which would indicate some bilaterally expressed control on the after-discharge. Extremely high voltage electrical after-discharge may be present in the hippocampal formation with only minimal disturbance in the dorsolateral cortex, at least by transverse recording, and without the precipitation of a major convulsion.