Table 1.

This table summarizes subjects’ accuracy for gel electrodes in an earlier study (Guger et al., 2009) and dry electrodes in the present study.

Row-column speller classification accuracy in %	Gel electrodes (N = 81; Guger et al., 2009)	Dry electrodes (N = 23)
100	72.8	69.6
80–100	88.9	87.0
60–79	6.2	8.7
40–59	3.7	4.4
20–39	0.0	0
0–19	1.2	0
Average accuracy of all subjects	91.0 ± 18.5	90.4 ± 17.2

N specifies the number of subjects summarized in each column.