Figure 3 | Scientific Reports

Figure 3

From: States and traits of neural irregularity in the age-varying human brain

Figure 3

Time–frequency patterns of oscillatory power and phase coherence as a function of pre-stimulus entropy. (A) Pre-stimulus power decreases with increasing entropy. Oscillatory power between 1 and 29 Hz significantly decreased with increasing pre-stimulus WPE. Colors indicate z-values resulting from a cluster-based permutation dependent samples t-test that compared slopes of linear trends across four bins of oscillatory power against zero, which were derived by sorting for increasing pre-stimulus entropy. The resulting negative cluster (p = 0.0009) is outlined in white and revealed a fronto-central topography. The bar graph shows average power within the cluster per bin (±1 between-subject standard error of the mean, SEM). Darker colors correspond to higher pre-stimulus entropy. (B), Low-frequency (theta) phase-coherence at S1 increases with entropy. ITC around the onset of S1 increased with pre-stimulus entropy. Colors again indicate z-values from a similar cluster-based test as outlined for power, testing linear slopes across four bins of ITC against zero. One positive cluster around S1 onset (−0.25 to 0.30 s, 4–12 Hz) with a predominantly central and frontal topography was found (p = 0.02) and is outlined in white. The bar graph shows average ITC within the positive cluster per bin (±1 SEM). Darker colors in the bar graphs correspond to higher pre-stimulus entropy.