them as members of the same assembly. Third, the field size (i.e., the ‘lifetime’ of activity) is inversely related to the oscillation frequency of the neuron. As a result, neurons which oscillate faster have smaller place fields and display steeper phase-precession slopes, as is the case in the septal portion of the hippocampus, compared to neurons in more caudal (temporal) parts of the structure, which oscillate slower, have larger place fields and less steep phase-precession slopes (Kjelsrup et al., 2008; Maurer et al., 2005; 2006a; Royer et al., 2010; Wiener et al., 1994). The dynamic local adjustment of these interdependent parameters is responsible for the globally coherent theta oscillation in the hippocampal system (Bullock et al., 1990; Buzsáki 2002; Geisler et al., 2010; Lubenov and Siapas, 2009).
