Hi Joe, On 05/29/2013 01:00 AM, Joseph Dien wrote: > I need to extract the beta weights from a cluster identified with > FS-Fast in order to compute percentage signal change. > > 1) I see a file called beta.nii.gz that appears to have the beta > weight information. It has a four dimensional structure and the > fourth dimension appears to be the beta weights. Is there an index > somewhere as to which beta weight is which? Or if not, how are they > organized? For the first level analysis, the first N beta weights correspond to the N conditions in the paradigm file. The rest are nuisance variables. > > 2) In order to extract the cluster, it looks like I would > use mri_label2vol to convert cache.th20.neg.sig.ocn.annot into a > volume where the voxels are tagged with the number of the > corresponding cluster. Is that from a group analysis? > > I could then use that to generate masks to extract the information I > need for each cluster from beta.nii.gz. If this is from a group analysis, then there should already be a file there (something.y.ocn.dat) that has a value for each subject in the rows and a value for each cluster in the columns. > > Is that correct? > > 3) The final information that I would need is the canonical hrf shape > generated by FSFAST for a single event. I guess I could generate that > by setting up a dummy analysis run with a single event of the desired > duration and then look in the X variable in the resulting X.mat file? try this plot(X.runflac(1).flac.ev(2).tirf, X.runflac(1).flac.ev(2).Xirf) > > Sorry for all the questions! > > Joe > > > > > -------------------------------------------------------------------------------- > > Joseph Dien, > Senior Research Scientist > University of Maryland > > E-mail: jdie...@mac.com <mailto:jdie...@mac.com> > Phone: 301-226-8848 > Fax: 301-226-8811 > http://joedien.com// > > > > > > > > > > > > > > _______________________________________________ > Freesurfer mailing list > Freesurfer@nmr.mgh.harvard.edu > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
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