Figure 3. Developmental reduction of the quantal content (mean eIPSC amplitude) due to changes in the number of release sites and release probability.

A, mean eIPSC amplitudes at different ages. B, the quantal size (median dIPSC amplitude) does not exhibit age dependence. C, RRP size is significantly smaller at P3 and P6. D, mean release probabilities (P = eIPSC/(RRP × dIPSC)) obtained for different ages. Note that a significant reduction in p occurred by P3.