Abstract
Electroencephalograms and direct records from the temporal, central, frontal and hippocampal surfaces of three patients with temporal lobe epilepsy are presented. Light sleep and drowsiness induced by Evipan resulted in sinusoidal slow rhythms of the hippocampus most pronounced during waking up from anaesthesia. This hippocampal synchronization showed some similarity to the hippocampal “arousal reaction” described in animals; it displayed a contrast with the simultaneous desynchronization of neocortical regions. Hippocampal spike discharges could be intensely activated by light sleep and drowsiness during waking up. Awakening caused by strong peripheral stimulation proved to be more effective than spontaneous lightening of anaesthesia. An inverse relation between sleep activation of hippocampal discharges and of temporal neocortical spikes was observed in a case with sclerosis of Ammon's horn. Background irregular or rhythmic slow waves, as well as spike discharges in hippocampus, were abolished by deep sleep.
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