Fig. 1

Enhancement of LFP synchronization between PL and IL during fear extinction learning. a Experimental protocol. b Freezing response to CS+ during extinction learning session. Black line indicates average of all rats and gray lines indicate individual data (n = 5). c, d LFP power spectra in PL (c) and IL (d) during CS+ presentation in early (black), middle (orange) and late (blue) phases of extinction learning. Solid lines and shaded areas indicate average and standard error of the mean (SEM) across animals, respectively. Insets show zoomed-in view of the power spectra. e, f Power density averaged over fast gamma frequency (100–200 Hz) in PL (e) and IL (f). g Coherence between PL and IL during CS+ presentation in early (black), middle (orange) and late (blue) phases of extinction learning. h Coherence between PL and IL averaged over fast gamma frequency (100–200 Hz). * p < 0.05; ** p < 0.01; One-way repeated measures ANOVA and post-hoc Newman–Keuls test. Each error bar indicates SEM across animals. The results of the statistical analyses are described in Additional file 1