You can use the motion file as the input to -stim_file but not to -stim_times. Also, you can only use 1 column from the motion file at a time in the -stim_file option. So if you have 6 columns, then you need 6 -stim_file options, as in
-stim_file 1 motion.1D'[1]' -stim_label 1 'dx'
-stim_file 2 motion.1D'[2]' -stim_label 2 'dy'
etc.