Figure 9.
Channel subsets chosen by each method for three representative subjects. Subjects 3, 11, and 16 (as sorted by AUC score in Figure 5) represent users who observe good, average, and poor performance, respectively, with the standard channel subset. Often, the effective methods (SFS, KFMR, and Jumpwise) include only a few of the standard channels, although those methods frequently selected many of the same channels. The Maximum SNR methods selected very different subsets than the standard set or the effective methods, with the exception of Subject 11 (the only subject to observe improved performance with the SNR subsets). Two methods very rarely selected identical subsets for a given dataset.