Sources of cortical rhythms in adults during physiological aging: a multicentric EEG study - Babiloni, C; Binetti, G; Cassarino, A; Dal Forno, G; Del Percio, C; Ferreri, F; Ferri, R; Frisoni, G; Galderisi, S; Hirata, K; Lanuzza, B; Miniussi, C; Mucci, A; Nobili, F; Rodriguez, G; Luca, RG; Rossini, PM (Hum Brain Mapp, 2006)