1. File Format EEG data were recorded from 12 healthy individuals over four sessions using BCI2000 file format. Please refer to the following link for details about the file format: http://www.bci2000.org/wiki/index.php/Technical_Reference:BCI2000_File_Format 2. Data Processing The raw data can be loaded using commands from the BCI2000. Example: [signal, states, parameters] = load_bcidat(filename); where signal: EEG data states: information about the data (states.StimulusCode provides the labels of the data) Data processing can also be easily done using an open-source MATLAB toolbox, BCILAB. 3. Stimulus Codes The stimulus code for each of the different tasks are as follows: 1: REST 2: MI-GRASP 3: MI-ELBOW 4. Electrode Positions The electrodes Fp1,Fp2,F3,F4,C3,C4,P3,P4,O1,O2,F7,F8,T7,T8,P7,P8,Fz,NAS,Fz,Oz corresponding to channels 1-20 in data set are those that were used. The other electrodes, on the other hand, were not considered because they were very close to muscle EMG sources and therefore most susceptible to artifacts.