Real-Time Analysis of EEG Indexes of Alertness, Cognition, and Memory Acquired With a Wireless EEG Headset. - Chris Berka; Daniel J. Levendowski; Milenko M. Cvetinovic; Miroslav M. Petrovic; Gene Davis; Michelle N. Lumicao; Vladimir T. Zivkovic; Miodrag V. Popovic; Richard Olmstead (Int. J. Hum. Comput. Interact., 2004)