Fig. 4.
Comparison of correlation measures as a function of epoch length. a Values of t obtained in an eyes closed versus eyes open paired t test as a function of epoch duration. b Values of −log10 PNULL for the corresponding probabilities of the null hypothesis. a, b Squares identify results from the Pearson product moment correlation. Diamonds identify results from the Spearman rank order correlation. The letter x identifies results from the Kendall rank order correlation and circles identify results obtained with mutual information