Effect of CTZ on synaptic responses at Schaffer collaterals-CA1 synapses. (a) EPSCs recorded at 24°C (P3 rat). Bath perfusion of CTZ (50 μM, bars) induced the appearance of successes to the first stimulus (in both conditions, five traces are shown). (b) Time course of CTZ effect on the amplitude of the first (open circles) and second (filled circles) EPSCs, before, during, and after CTZ application (50 μM, bars) for the cell shown in a.