This paper proposes a brain-computer interface (BCI) wheelchair that integrates the advantages of event-related potential (ERP) and motor imagery (MI). The ERP, known as P300, is generally used to observe ERP, which is based on visual evocation. For example, users are presented with a screen that flashes possible targets. Users have to focus on the desired target and the result of ERP is recognized as targets and nontargets to control corresponding devices. P300 has the advantages of requiring no initial user training and easy to be observed in a simple and discriminative task [1]. Therefore, P300 is used to pick one target among a series of stimuli, such as forward, backward, speed-up, and slowdown. However, the low transfer rate is the concern of P300. Hence, the MI method is implemented to reinforce the system [2]. MI is efficient to continuous control...

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