To assess the correlation between connectivity measures (i.e., lagged phase synchronization values) and the cognitive level, as an external clinical variable, the product-moment correlations of lagged phase synchronization between all pairs of ROIs and MMSE scores were computed by eLORETA, and the critical probability threshold (p = 0.05) for the data r-values, adjusted for multiple comparisons, was determined by the nonparametric randomization procedure [58].
