Figure 6.

Spatially irregular firing patterns of layer 3 neurons, which carry significant spatial information. Spike-trajectory plot, rate map, and 2D spatial autocorrelation of MEC layer 3 recordings, which carry significant spatial information (see Materials and Methods). Numbers above the rate map indicate maximum firing rate. T indicates cells recorded with tetrodes (1 × 1 m arena); all other cells are from juxtacellular recordings (70 × 70 cm arena). The neuron indicated with the asterisk (*) met the border criteria (border score, 0.52) and was thus included in this category (Fig. 7A; see Materials and Methods).