Theta phase stability and power during the spike-free period (FP). (A) While theta power in epilepsy was greatly reduced compared to the control condition (BI), theta power during FP showed no difference from the power before spikes, both in latent and chronic stage (paired t-test, p>0.99). (B) Compared to the control condition (BI), theta phase stability was higher in both D7 and D25 groups. Theta phase stability during FP reflects a higher synchrony compared to BI, both on D7 (43% change from BI, bootstrapping, p<0.01) and D25 (29% change from BI, bootstrapping, p<0.05).