Figure 6.

(A) The bar graph represents the mean and the standard deviation of the Pearson’s correlation coefficients between the three dry electrode types and the traditional wet ones with respect to the electrode position. The red asterisk indicates the comparison where the ANOVA revealed significant differences. (B) The bar graph represents the mean and the standard deviation of the Pearson’s correlation coefficients between the three dry electrode types and the traditional wet ones with respect to the frequency. The red triangle indicates the case of non-significant correlation (on average) with traditional wet electrodes.