Re: [Freesurfer] calculating percent signal change

2010-09-30 Thread Douglas N Greve
Hi Thomas, you may have found a bug in my scale factor calculation. Can you compute the new scale factor as described below? BTW, these issues are fixed in version 5. cd bold/analysis x = load('X'); tirf = x.flac0.ev(3).tirf; Xirf = x.flac0.ev(3).Xirf; scalefOld = sum(Xirf .* repmat(tirf,[1 size

[Freesurfer] calculating percent signal change

2010-09-30 Thread Thomas Janssens
Hello, I am trying to calculate the percent signal changes for my monkey data. I did this by running the command selxavg3-sess and looking at the cespct values (or equivalently by using h.nii divided by h-offset.nii). I found in the mailing list that this value should be corrected by a scaling f