Hi experts,

I have three questions. I would really appreciate any help.

(1). I ran following commands to estimate relationships between LGI and Behav data:

 mris_preproc --fsgd Behav.fsgd --target fsaverage --hemi lh --meas pial_lgi --out lh.Behav_LGI.mgh

mri_surf2surf --hemi lh --s fsaverage --sval lh.Behav_LGI.mgh --fwhm 10 --cortex --tval lh.Behav_LGI.10.mgh

mri_glmfit --y lh.Behav_LGI.10.mgh --fsgd Behav.fsgd dods --C Corr-Behav-cor1.mtx --surf fsaverage lh --cortex --glmdir lh.Behav_LGI_P.glmdir --eres-save

mri_glmfit-sim_nonortho --glmdir lh.Behav_LGI_P.glmdir --sim perm 2000 1.3 permcsd --sim-sign pos --cwpvalthresh .05 --perm-resid --overwrite

Finally, cluster summary gives me one clusters with peak at the fusiform gyrus as following:
ClusterNo  Max   VtxMax   Size(mm^2)  MNIX   MNIY   MNIZ    CWP    CWPLow    CWPHi   NVtxs    WghtVtx   Annot
   1       -4.045   10153  32101.81    -36.5  -39.5  -15.1  0.00050  0.00000  0.00100  64731  -106698.82  fusiform 

As you can see number of voxels is 64731, so I when I viewed the results in FreeView, its showing me a big cluster, almost all over the brain (please see attached screen shot).

Could you please tell me why I am getting these sort of results, and how can I fix this? If I change cluster forming threshold from 1.3 to 3, would that work? I wanted to make sure before I re-run the analysis because mri_glmfit-sim_nonortho command takes about a day to finish.

(2). How can I save output cluster e.g. fusiform gyrus in above example in NIFTI MNI volume space so that I can use this cluster for functional connectivity analysis?

(3). If I want to use fusiform gyrus from standard FreeSurfer parcellation rather than from my results, how can I save that in standard MNI volume space?

Thank you so much !