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Differences within the alpha band range. The cluster in blue represents an increase in relative power within the a-sd-MCI group in occipital regions (cluster α 1), as compared with the a-md-MCI group. The control group showed more relative power in right fronto-temporal areas (cluster α 2), in bilateral occipital regions (cluster α 3), and in right lateral fronto-temporal regions (cluster α 4) than both MCI groups. These clusters are represented in green color
