40 participants. FOR EACH PARTICIPANT THERE ARE TEN FOLDERS. SIX FOLDERS CONTAIN THE FIELDMAPS COLLECTED RIGHT BEFORE THE FUNCTIONAL RUNS (TWO 'GFM_SD_FRAME_1' BEFORE THE FIRST FUNCTIONAL RUNS; TWO 'GFM_SD_FRAME_2' BEFORE THE SECOND FUNCTIONAL RUNS; TWO 'GFM_SD_FRAME_3' BEFORE THE THIRD FUNCTIONAL RUNS). THREE FOLDERS CONTAIN THE FUNCTIONAL IMAGES (RUN 1='SD_FRAME_1'; RUN 2='SD_FRAME_2'; RUN 3='SD_FRAME_3'). ONE FOLDER CONTAINS STRUCTURAL IMAGES ('T1_MPR_32CH_ISO').