[Freesurfer] mkanalysis-sess

Hello,

I am using mkanalysis-sess command to configure analysis and I have some questions.

1, After run preproc-sess on raw data, why would we want to repeat all the flag using for preprocessing at mkanalysis-sess (-stc up -fwhm 5). Is it gonna effect to our f.nii if I input different value from the previous preproc-sess command ?

2. -refeventdur: I read that if we have different duration of stimuli, we can set the -refeventdur equal the mean of all stimuli durations. But in my study, the duration of stimulus depends on the reaction time of subject, so it's gonna be different for each subject. how can I manage that?

Thank you, Trinh