P300-based brain-computer interface communication: evaluation and follow-up in amyotrophic lateral sclerosis - Silvoni, Stefano; Volpato, Chiara; Cavinato, Marianna; Marchetti, Mauro; Priftis, Konstantinos; Merico, Antonio; Tonin, Paolo; Koutsikos, Konstantinos; Beverina, Fabrizio; Piccione, Francesco (Frontiers in Neuroscience, 2009)