What you have described should work. The residuals will be in whatever space the analysis was made in (mkanalysis-sess). What ROI are you trying to get an average over? What are your mkanalysis-sess and mri_segstats commands?
On 05/22/2018 10:26 PM, Mcnorgan, Christopher wrote: > Hi, > > I have some BOLD data from a fast event-related experiment with 3 > experimental conditions, 1, 2 and 3. A reviewer wants me to isolate > the signal for condition 1. Under the assumptions of the GLM, the > signal is a linear combination of A1+B2+C3+Error, so it seems that I > need to construct a design matrix that contains only the onsets for B > and C, and then run selxavg3-sess with the —svres argument given. The > residuals should thus be the best estimate available of condition 1 + > error. So in a nutshell, I want the best approximation of the > preprocessed BOLD time series, as though conditions 2 and 3 never > happened, but without any other transformation of the BOLD data. > > I have a student working on this, but he’s running into a problem of > the residuals no longer being in anatomical space, or at least the > same anatomical space he started in (mri_segstats is reporting a > dimension mismatch, which is why I emphasized above I don’t want any > other transformations applied to the data). The data were originally > processed in fsaverage space. Barring my student accidentally > switching to the subject’s native surface space, is there any reason > what I’ve described above shouldn’t work? > > /********************************************** > * Chris McNorgan > * Assistant Professor > * Department of Psychology > * University at Buffalo, > * The State University of New York > * http://ccnlab.buffalo.edu/ > * Office: 716.645.0236 > * Lab: 716.645.0222 > **********************************************/ > > > > > > > _______________________________________________ > Freesurfer mailing list > Freesurfer@nmr.mgh.harvard.edu > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer The information in this e-mail is intended only for the person to whom it is addressed. If you believe this e-mail was sent to you in error and the e-mail contains patient information, please contact the Partners Compliance HelpLine at http://www.partners.org/complianceline . If the e-mail was sent to you in error but does not contain patient information, please contact the sender and properly dispose of the e-mail.
