Fig. 3

Short-term dynamics of fEPSPs in DH and VH. Data presented in this figure are the same as the data presented in Fig. 2, but here values obtained from DH (circles) and VH (squares) are plotted on the same graphs for facilitating comparisons between the two hippocampal segments. Data obtained with the three stimulation current intensities, i.e. subthreshold, suprathreshold and submaximal are shown in a–c respectively. Statistically significant differences of responses evoked along the entire stimulation train, between the two hippocampal segments are shown by horizontal bars (MANOVA along entire train of responses and independent t-test of individual responses along the train, *p < 0.05, **p < 0.01, ***p < 0.005). Note that changes of fEPSPs induced by the stimulation train, including steady-states of fEPSP changes (i.e. averages of 8–10th responses, bottom-right graphs in each panel) significantly differ between DH and VH at 3–100 Hz with subthreshold stimulation, 1–50 Hz at suprathreshold stimulation and 5–30 Hz with submaximal stimulation. The frequency range of statistical significance of dorsoventral differences in the three graphs of steady-state responses is marked by a horizontal bar without asterisk. Note that steady-state depression induced by high-frequency suprathreshold and submaximal stimulation (at 75–100 Hz and 40–100 Hz respectively) did not significantly differ between the two hippocampal segments (independent t-test, p > 0.05)