Short-term synaptic dynamics during repeated stimulation differ between CBA/CaJ and DBA/2J mice. A: eIPSCs during a 100-Hz stimulus train (50 pulses) from example bushy cells of CBA/CaJ and DBA/2J mice at two different ages. Ticks above the traces mark stimulus timing, and the dashed line is the resting current. Stimulus artifacts are removed for clarity. B: normalized eIPSC size relative to the first eIPSC during the 100-Hz train (as in A) from all bushy cells. CBA/CaJ mice show slight facilitation during the train, while DBA/2J mice show initial facilitation followed by depression. C: summary of the average steady-state eIPSCs, shown as the normalized mean of the last 40 eIPSCs during the train relative to the first eIPSC, from all bushy cells in each group. *Bonferroni-corrected posttest after two-way ANOVA: P < 0.05. D: summary of steady-state charges, calculated as the cumulative charge from the last 40 eIPSCs of the train, from all bushy cells. **Bonferroni-corrected posttest following two-way ANOVA: P < 0.01.