P4‐274: EEG SIGNATURES ASSOCIATED WITH RESTING STATE, MEMORY AND ATTENTION AS POTENTIAL RELIABLE BIOMARKERS OF COGNITIVE DECLINE IN ALZHEIMER'S DISEASE. (1st July 2019) - Meghdadi, Amir H.; Berka, Chris; Rupp, Greg; Smith, Stephanie; Mcconnell, Marissa; Hamilton, Joanne; Salat, David H.