Theta oscillations are essential to temporal encoding in the hippocampus; they clock hippocampal activity during awake behaviour and rapid eye movement (REM) sleep. Although these 4–10-Hz oscillations are widely believed to be synchronized throughout the hippocampus, they are now demonstrated to form waves that travel across the hippocampal circuit, making the organization of time in the hippocampus similar to that on Earth—a progression of local time zones.
- Evgueniy V. Lubenov
- Athanassios G. Siapas