Fig. 2.

Hippocampal (HP) and cortical (CTX) LFPs during the transitional period from wakefulness to SWS. A: classified behavioral states during a 15-min period when a rat transitioned from wakefulness to sustained SWS. B: EMG, CTX LFP, and HP LFP during the same time period. C: expanded view of the CTX and HP LFPs at the boxed time points (I–IV) in B. Arrows highlight a theta wave, 3 ripple events (at various time scales), an HVS event, and a delta wave. Note the HVS and ripple events during the transition from wakefulness to SWS.