Fig. 5: Relationship of spontaneous and evoked activity for oscillatory and fractal components of the power spectrum, assessed using the method of pseudotrials.

a Pseudotrial-corrected time courses for oscillatory power in high prestimulus (red) and low prestimulus (blue) conditions. Line shows mean across all sensors and subjects, shaded area indicates standard error of the channel-average time course across subjects. Effect topographies are shown at 100 ms, 300 ms, 500 ms, and 700 ms; white dots indicate sensors which are part of a significant cluster. Shaded overbars indicate the significance of the difference between prestim high and low conditions. The shade of the bar indicates the percent of sensors which are part of a significant cluster at any given time point (i.e., darkest = all sensors part of cluster, lightest/white = no sensors part of cluster); red indicates positive clusters (prestim high > prestim low), blue indicates negative clusters. b As a, but for two parameters of scale-free activity: the slope (i.e., scaling exponent) and intercept (i.e., broadband offset). N = 49 participants.