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\section{Introduction}  As of 1999, more than 3 million people suffered from physical disabilities in Japan, according to Annual Reports on Health and Welfare of 1998-1999. In Brazil, numbers are even worse: more than 10 million people had declared to suffer from some kind of motor difficulty [2]. Different approaches from several fields have been developed along the years in order to attend to these people's necessities. Among them, one in particular has shown promising results -- the usage of brain signals to aid patients in the task of interacting with the world.