Preliminary analyses revealed that age, gender, and medication status showed systematic relationships with one or both diagnostic groups (see Table 1), therefore they were included as covariates in all power and coherence analyses. Participants with power values exceeding 3 times the interquartile range of the grand average within each diagnostic group for a particular frequency band at any region were excluded from the corresponding analysis. Significant main effects were followed up with post-hoc pairwise comparisons, which were adjusted using a Bonferroni correction. When assumption of sphericity was violated, the Greenhouse-Geisser estimates were reported. All statistical analyses were conducted in SPSS 16.0 (SPSS Inc., Chicago, IL, USA).
