“…Motor imagery is defined as the mental simulation of a kinesthetic movement (Decety and Inqvar, 1990;Neuper et al, 2005). Signal processing algorithms, individual users' characteristics, such as psychosocial and physiological parameters (e.g., fine motor skills) or brain structures, can predict performances for SMR-based BCIs Halder et al, 2011Halder et al, , 2013Hammer et al, 2011;Randolph, 2012). Besides these factors, feedback is a necessary feature for initial learning of the BCI skill (Brown, 1970;Kuhlman, 1978;McFarland et al, 1998;Wolpaw et al, 1991Wolpaw et al, , 2002.…”