Re: [Freesurfer] cespct in FS 5.3

2016-06-08 Thread S.V.Shepherd [work]
The built-in Intensity normalization is a constant multiplied to each run's data based on the per-run mean, right? It thus normalizes global intensity variation across subjects, but not regional, right? Whereas my approach would normalize regional variation in signal strength (good), at the risk

Re: [Freesurfer] cespct in FS 5.3

2016-06-07 Thread Douglas Greve
Rescaling by the voxel mean will mess up the intensity normalization. Try making your analysis (mkanalysis-sess) with -no-inorm and see if the results are more consistent. They will not be exact because the raw mean time course is not used to create the cespct. Rather it is the regression

[Freesurfer] cespct in FS 5.3

2016-06-06 Thread S.V.Shepherd [work]
Hi all, I ran an analysis on data after dividing each voxel mean across the run, and then multiplying by 100. (My intuition was that the percent signal change should be more consistent across varying SNR that the non-normalized betas). I had naively expected ces.nii and cespct.nii to be