Dear Freesurfers,

 

I used the following command line to find significant clusters after glm analysis (before MC clusters attached)

 

mri_glmfit-sim \
  --glmdir lh.meditation_age.glmdir \
  --sim mc-z 5 4 mc-z.negative \
  --sim-sign neg --cwpvalthresh 0.05\
  --overwrite

 

I didn't find any, i.e., there are no clusters listed in file mc-z.negative.sig.cluster.summary. Does this mean that I should accept the null hypothesis for the whole cortex?

 

Also, how many iterations of mc do people typically perform? I guess it doesn't make a difference if I do 1000 iterations instead of 5 anyways.

 

Thank you very much!

 

Sincerely,

Ye