Fig. 4

Mean excitatory post-synaptic potential (EPSP) slope in dentate gyrus granule cells following 400-Hz high-frequency stimulus applied to the perforant pathway. There were no significant differences between groups, except at 60 min, when the EPSP slope for the 5 mg/kg methamphetamine group was significantly greater than that for the other groups (^**P < 0. 01, n = 8)