Good morning!

We are running a GLM with two groups (patients versus controls) and one variable (age).

We are using the following option to correct for multiple comparisons:

mri_glmfit-sim --glmdir ${glm_dir}/${hemi}_contrast-${contrast}_${surfname_t1} --cache 1.3 pos

If we change the option "pos" with "neg" or "abs", we obtain exactly the same cluster (attached).

Is this normal? What is the option "pos" staying for exactly?

Thanks,

Valeria