frequency bands, as indicated by logistic regressions on linear and nonlinear connectivity values. However, the topographic distribution of these connectivity deficits was not explored [20]. Sankari et al. using a comprehensive EEG coherence analysis found decreased temporo-parieto-central functional connections along with a hyperconnectivity pattern in left temporo-parietal and frontal regions [18]. Interestingly, although different frequency bands were involved in the aforementioned studies reporting regions with functional hyperconnectivity in AD, this activity has consistently been found most pronounced in the theta band, which is in line with the increase in theta phase synchronization observed in patients with AD in our study.
