Effect of prolonged stimulation on cerebral hemodynamic: A time-resolved fNIRS study. - Butti, Michele; Contini, Davide; Molteni, Erika; Caffini, Matteo; Spinelli, Lorenzo; Baselli, Giuseppe; Bianchi, Anna Maria; Cerutti, Sergio; Cubeddu, Rinaldo; Torricelli, Alessandro (Medical Physics, 2009)