Distribution of fast PSP amplitudes in B31/B32 from S1 neurons. Only EPSPs are produced. Excitation is increased for the fifth PSP within a train after learning. Conventions within the figure are as those in Figures 1, 2, and 4. Data are shown separately for the three stimulus trains of five spikes each and for the first (A) and fifth (B) PSP in a stimulus train. Color-coded asterisks show significant effects between naive animals and animals that had learned (see statistics in the text). The overall medians shown are the median amplitudes derived from averaging all three measurements for the first or the fifth PSP elicited by a stimulus train. N = 85 connections were sampled in 12 preparations from naive animals, and N = 87 connections were sampled in 12 preparations from animals that had learned.
