I'm using the " B0101T.gdf " file from the BCI Competition-2008, Graze data set set -B (BCICIV_2b). it contain the data set of two class ( class-1 -Left movement class-2- Right movement) . The loaded file contain signal of matrix 604803x6 and Header file. My problem is that I don't know how to extract the part of motor imagery action from the matrix in MATLAB. Can any body help me please ? Here i attached the picture of list of event type.