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. Author manuscript; available in PMC: 2015 Jun 3.
Published in final edited form as: Neuron. 2014 Nov 11;84(5):1079–1090. doi: 10.1016/j.neuron.2014.10.048

Figure 4.

Figure 4

A Mexican Hat shaped relationship exists between grid cell-grid cell distance and mean track firing pattern correlation. A. Examples of higher (left) and lower (right) correlations between mean track firing patterns (mean of ΔF/F versus track position) of nearby (left) and mid-distance (right) grid cell pairs. B. Plot of mean grid cell – grid cell distance versus mean track firing pattern correlation averaged over all grid cells in all acquired time-series (black). Same plot is also shown for a randomized data set in which grid cells were left in the same location but were randomly assigned the mean track firing pattern of a different grid cell (red). Thick dark line represents moving average (30 micron window) with light bands depicting SEM. Thin dark line represents mean of data binned at 10 micron increments. ** denotes P < 0.01, from bootstrapping. C. Mean track firing pattern correlation for grid cells separated by 20–50 μm, 111–147 μm, and 200–256 μm. ** denotes P < 0.01, Tukey-Kramer. Error bars indicate SEM.