Intermediate stimulus comparisons
To ensure that the found correlation was not an artifact of the
extracted thresholds, Samaha & Postle also conducted tests with the
proportion of correct responses on the intermediate stimulus onset
asynchrony (30 ms gap). We replicated this analysis, and found a
moderate correlation between the proportion correct and peak alpha
frequency from eyes-closed EEG-recording (r = 0.33, P < 0.05,
one-tailed). We found no statistically significant correlation for peak
alpha frequency extracted from electrode B7 for pre-stimulus
EEG-recording (r = 0.28, P = 0.07, one-tailed).