For people who suffer from neurological diseases such as ALS, who are unable to have any motor functions but still have some cognitive abilities, Brain Computer Interfaces (BCIs) are a good mean to communicate with the world through only their brain activities. The main idea of a BCI is to convert the brain activities to commands for computer or artificial limbs. The main features of EEG that using in BCIs are brain rhythms and event-related potentials (ERPs). P300 is a component of an Event ERP which is the natural response of the brain after a specific stimuli with about 300 ms delay. BCI development has grown fast from 1998 whe the first BCI based on P300 so called oddball P300-Speller paradigm was introduced by Farwell and Donchin. In a P300 based BCI system, P300 component is usually detected by using preprocessing and feature extraction methods to enhance signal that can be fed into a ltr" Keywords: BCI, EEG, P300, SVM, DWT
