We reasoned that these corresponding changes in mPFC and BLA gamma power might reflect periods of increased gamma-gamma synchrony. Indeed, the probability of mPFC-BLA near-zero phase lag synchrony (Supplementary Experimental Procedures) was significantly higher during the CS− in discriminators (sign-rank, p<.05; Figure 6C) but not generalizers (p>.05), and there was a corresponding linear correlation between the change in fast gamma synchrony and discrimination score across animals (Figure 6C; r=.45, p=.04). These findings indicate that the mPFC and BLA exhibit strong synchrony in the fast gamma range during periods of relative safety.
