Re: [Freesurfer] functional ROI analysis problem

2011-04-08 Thread Douglas N Greve
Hi Katie, this is a problem in version 4 in which the scaling is a little weird. It has no effect on the statistics (ie, p-values), but when you extract the percent signal change, they appear to be very low. This has been fixed in 5.X. For 4.X, you will need to compute a scaling factor. This c

Re: [Freesurfer] functional ROI analysis problem

2011-04-11 Thread Katie Bettencourt
Ok, I ran that and a couple questions. I ran it on 2 different subjects and got the exact same value, is that expected? Do I need to run it for each subject? Also, do I need to do this for event-related designs as well, or just block designs? I tried to run it on another analysis I did, an even

Re: [Freesurfer] functional ROI analysis problem

2011-04-11 Thread Douglas N Greve
Yes, it should be the same across all subjects. You only need to do it for designs that use an assumed shape (-gammafit). doug Katie Bettencourt wrote: > Ok, I ran that and a couple questions. I ran it on 2 different > subjects and got the exact same value, is that expected? Do I need to > ru