An Optimized Channel Selection Method Based on Multifrequency CSP-Rank for Motor Imagery-Based BCI System

Figure 6

The topographic maps of the selected channels for two datasets under different frequency bands. Channels selected more than three times out of all subjects were marked. The channels selected by CSP-R-MF algorithm in 8–30 Hz frequency band were the same as those selected by CSP-rank algorithm. The electrode could be found in Table 2 with the number in topographic maps.