Figure 2.

Left: topographic map that is optimized for a frequency-domain single phase model of a sample EEG, at a frequency of 11.5 Hz. In this example, the map explained 80.9% of the total variance at that frequency. Black and white map areas indicate opposite polarity. Middle: the power map corresponding to the single phase model on the left. Right: conventional power map of the same data at 11.5 Hz. The power map derived from the single phase model is very similar to the conventional power map.