“…Although this electroencephalographic (EEG) activity has been observed in several brain regions, for example, entorhinal cortex (Alonso and Garcia‐Austt, ) or cingulate cortex (Landfield and McGaugh, ), the hippocampal formation (HPC) is considered to be the main structure involved in the generation of theta (Bland, ). Theta rhythm in rodents has been postulated to be involved in arousal (Green and Arduini, ), attention (Bennett, ), behavioral functions (Vanderwolf, ; O'Keefe and Nadel, ), sensorimotor integration (Bland and Oddie, ), cognitive processes (Winson, ), and emotion (Gray, ).…”