Fig. 3

Population spike (PS) amplitude and field excitatory postsynaptic potential (fEPSP) slope, assessed in a representative sample field potential in the hippocampus of the control rats (A). Sample traces of evoked field potential were recorded in the dentate gyrus (DG) of the hippocampus before and following high-frequency stimulation (HFS) of the perforant pathway (PP) in all groups (B)