“…Paper Category (Bermúdez et al, 2010), (Cabrera et al, 2008), (Chin et al, 2010), (Deepa et al, 2010), (Okasaka and Hoshino, 2012), (Schalk et al, 2008), (Sorger et al, 2009), (Sun et al, 2010, (Thomas et al, 2008), (Thompson et al, 2013), (Ortner et al, 2011), (Al-Abdullatif et al, 2013), , , (Ming et al, 2009) BCI (Hanson et al, 2010) Speech generator device (Keegan et al, 2009) EOG (Joubert et al, 2011) Exploratory study (Ann and Theng, 2011b) Facial expression (Park et al, 2012), (Cipresso et al, 2011) Eyetracking (AlJa 'am et al, 2008), (Ann and Theng, 2011b), (Friginal et al, 2013), , (Sorna et al, 2009), (Hsieh et al, 2009) Software modeling , , , (Silva and Pereira, 2011), (Tsai, 2013) Communication board (Belani, 2012), (Arnott and Alm, 2013), (Deepa et al, 2010), (Hill, 2010), (McCoy et al, 2013), (Mak and Wolpaw, 2009), Conceptual review (Alwell and Cobb, 2009), (Finke et al, 2008) Systematic review , (Prabhu and Prasad, 2011), Alternative virtual keyboard…”