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. 2007 Oct 24;27(43):11510–11521. doi: 10.1523/JNEUROSCI.3077-07.2007

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Copyright © 2007 Society for Neuroscience 0270-6474/07/2711510-12$15.00/0

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Figure 4. — Compound LTP consists of slow presynaptic and fast postsynaptic components. a, Changes in the mean fEPSP slope (red symbols) and mean spHp (peak ΔF; green symbols) time courses of 18 slices (128 boutons) in which LTP was induced by 200 Hz tetanization (down arrow; filled symbols) and for six slices (45 boutons) that were not tetanized (open symbols). b, The representative fEPSP (red; average of 4 traces) and activity-dependent changes in spH fluorescence (green; average of 4 boutons) before and after 200 Hz tetanization. The numbers represent time points in a. c, Changes in fEPSPs as a function of changes in peak ΔF measured 5, 30, 60, and 180 min after 200 Hz tetanus. Red lines show the linear fit of experimental data; the lines were generated by using least-squares approximation. Dotted lines represent the theoretical function fEPSP slope = peak ΔF. d, The time courses of changes in the mean fEPSP slope (red symbols) and mean peak ΔF (green symbols) after LTP was induced by 200 Hz tetanization (40 boutons, 5 slices). This experiment was similar to that in a, but measurements of spHp were done during the first 60 min after induction of LTP.