The frequency of spontaneous and miniature IPSCs is increased onto pyramidal neurons from conditioned rats compared with controls. A, The frequency, but not amplitude, of sIPSCs is increased onto CA1 pyramidal neurons of conditioned rats (closed circles) compared with naive (clear circles) and pseudoconditioned rats (gray circles). n: naive 20, pseudo 27, conditioned 22. Calibration: 20 pA, 250 ms. B, The frequency, but not amplitude, of mIPSCs (recorded in the presence of 100 nm TTX) is increased onto CA1 pyramidal neurons of conditioned rats compared with naive and pseudoconditioned rats. Calibration: 20 pA, 250 ms. n: naive 18, pseudo 19, conditioned 19. Note: *Fischer's PLSD p < 0.05. Smaller circles are the data points from individual neurons. Larger circles are the group means. In some instances, the SEM of each group is smaller than the size of the circle that represents the group mean data.