Hi Dr. Greve,

I doubt these results because of following:

(1). When I compare sig.mgh files created using following two commands i.e. correlation between LGI and CV versus CV and LGI:

mri_glmfit --y Corr_CV_LGI/lh.LGI.10.mgh --fsgd CV_LGI.fsgd dods --C Corr-VL-cor.mtx --surf fsaverage lh --cortex --glmdir Corr_CV_LGI/lh.VL.glmdir --pvr Corr_CV_LGI/lh.CV.10.mgh

and

mri_glmfit --y Corr_CV_LGI/lh.vol.10.mgh --fsgd CV_LGI.fsgd dods --C Corr-VL-cor.mtx --surf fsaverage lh --cortex --glmdir Corr_CV_LGI/lh.VL.glmdir --pvr Corr_CV_LGI/lh.LGI.10.mgh

(a). I do not get identical maps. Please find attached screen shot.

(b). Here, colorbar showing a value of around 30, does that reflect -log10(p)? I am not sure if thats normal?

(2). Assuming magnitude from colorbar is normal then I performed FDR correction- I am assuming its same command as following as mentioned in FS manual:

mri_glmfit-sim --glmdir Corr_CV_LGI/lh.VL.glmdir --cache 1.3 pos --cwp 0.01 --2spaces

After running FDR correction, cache.th13.pos.sig.cluster.mgh and cache.th13.neg.sig.cluster.mgh, none of these are showing me any significant clusters, instead its showing a constant magnitude (same color) over whole brain?

Thanks.