[ERG changes caused by stimulation of the reticular formation of the mesencephalon]

During stimulation of the Formatio reticularis mesencephali by different intensities in awake rabbits three types of the ERG were observed. During and 20 min after subthreshold stimulation (no alteration in the hippocampal EEG) the b-wave of the ERG was enhanced. However, the b-wave amplitude was diminished during stimulation and enhanced 20 min after stimulus application when the stimulus intensity evoked a hippocampal theta-rhythm of 5-7 waves/s. During and 20 min after RFm stimulation with the highest stimulus intensity which evoked a hippocampal theta-rhythm of 7-8 waves/s the b-wave was diminished.