Figure 5.

Curved spike raster arises from increasing the strength of the CA3 input component relative to the EC3 input component. Parameters are given in Table 1. A, Spike raster (spike phases plotted as a function of animal location when the spike was fired) of CA1 model cell firing when the relative strength of the EC3 component is weakened. Dotted gray line is the theta oscillation. B, Firing rate histogram (calculated as in Fig. 1D) of model CA1 cell spiking with these parameters. C, Spike raster of an experimentally recorded cell with a curved spike raster, reprinted with permission from Figure 2A of Mehta et al. (2002). D, Each bin is the fraction of total spikes fired at a particular theta phase plotted as a function of that theta phase, referred to as the theta-phase histogram. Two theta cycles are shown, and the dotted gray line is the theta oscillation.