Figure 5.

Spatial organization of heat maps was quantified using the Moran Index. Spike frequency maps and recruitment latency maps were characterized using the Moran Index, a spatial autocorrelation technique. Moran Indices ranged from −1 (perfect spatial anti-autocorrelation) to +1 (perfect spatial autocorrelation), with 0 corresponding to no patterns of spatial autocorrelation. To illustrate the Moran Index technique, simulated data are used to construct spatial maps (electrodes = 128) of varying degrees of spatial organization.