Yet, it should be noted that the dorsal and ventral regions of the HPC are interconnected and theta waves may travel along its axis (Patel et al., 2012); in fact, there is at least one study reporting that the magnitude of theta oscillations recorded from the dHPC in serotonin 1A receptor-deficient mice, a strain which displays increased anxiety-like behavior, increased in the EPM in respect to a familiar environment (Gordon et al., 2005). The gene discussed is HTR1A; the disease is Anxiety.