Conditional mutant mice lacking ErbB4 in PV-interneurons show deficits in excitatory synaptic activity. A, B, Representative traces of mEPSCs of one PV-positive interneuron in PV-Cre;ErbB4+/+ (A) or in PV-Cre;ErbB4−/− (B) PFC slices. Calibration: 40 pA, 50 ms. C, Cumulative distribution for mEPSC amplitude of data in A and B (Kolmogorov–Smirnov test; p < 0.01). D, Cumulative distribution for mEPSC interevent intervals of data in A and B (Kolmogorov–Smirnov test; p < 0.01). E, F, Histogram summary of data (mean ± SEM; *p < 0.05; n = 22 and 19 for ErbB4−/− mice and ErbB4+/+ controls, respectively).