Yes - I am interested in applying the monte carlo sim to my own model fit. Doug can you walk me through the steps I need to get this part done? When you say residuals, I am assuming that I need to supply a vector file of residuals after I fit my model to the smoothed data (eg. using mri_surf2surf --sval [concat thickness] --fwhm-trg [smooth level] etc. ) - correct? Since I don't have the --glmdir to supply, what are the other files or options that I need to manually supply for mri_glmfit-sim to run the correction? Thank you in advance!