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Effects of Penicillin on Evoked Potentials of Excised Prepiriform Cortex of Guinea Pig

The effects of replacing sodium chloride by sodium benzylpenicillinate on the evoked field potentials of in vitro preparations of guinea‐pig olfactory cortex were studied. The potentials evoked by supramaximal orthodromic electrical stimuli comprised an initial surface‐negative wave (EPSP); always one and sometimes two subsequent positive peaks (population spikes) were superimposed on the negative wave.