Theta waves are
low-frequency large-amplitude oscillations (6-7/s) recorded in and around the
hippocampus in a variety of mammals, notably rodents, rabbits, and marsupials.
Theta rhythms appear to correlate with motor activity, such that their timing
coincides with whisker movement and sniffing. These waves are typically
investigated with respect to their ostensible involvement in memory, as their
power correlates with impairments in memory-related tasks (e.g. spatial
alternation, spatial reversal) in lesion studies of the fornix and septum.
