FZ=54.4 ± 6.8, CZ=64.1 ± 6.8, PZ=88.4 ± 6.8), with the Parietal cortex having higher energy than the Central or Frontal cortices, as seen in Table 1. Evaluation of PLI values using MANOVA with repeated measures revealed a significant main effect of electrode location with higher PLI values in Central cortex than Parietal (F=12.2, df=2, 174, p<0.001) (grand means: FZ=0.44 ± 0.01, CZ=0.46 ± 0.01, PZ=0.39 ± 0.01). A significant main effect of tone was also found with increases in the PLI values obtained following the infrequent (target) tone as compared to the frequent (non-target) tone (F=208.6, df=1,174, p<0.001) as seen in Table 2. Significant main effects of group (active vs. passive task) were also seen (F=7.4, df=1,174, p<0.007), these results are presented in Figure 1B. The infrequent (target) tones had the same amplitude in the active vs. the passive task but the frequent tone had lower PLI values in the active task.
