Ok, is the first timepoint the baseline/0 condition?
My runs do not have every condition in them -- that is, the first run has condition 1-30, the second 31-60, etc... with 6 runs total.
Are the conditions still listed in order from the paradigm file in the beta.nii file? With all the nuisance regressors added at the end? That is:
baseline, cond. 1 -180, 35 nuisance regressors
Thanks,
Emily
On Fri, Dec 10, 2010 at 10:26 AM, Douglas N Greve <greve@nmr.mgh.harvard.edu
wrote:
The h.nii file has a very complicated structure. The beta file will have each condition in the order in the paradigm file plus nuisance variables.
doug
Emily Ward wrote:
I want to look at the beta values for all my conditions, voxel-by-voxel (in a specific ROI). I have 180 conditions, and am not looking at a specific contrast.
When I open the beta.nii file produced by selxavg3-sess, and look at configure functional overlay, there are 215 "timepoints" listed (and 0 "conditions). It appears that the beta values for the 180 conditions appear first, and there are 35 other regressors tacked on the end. When I open the h.nii file, there are 180 "conditions" and no timepoints.
However, when I read these into matlab using MRIread (to get the voxel-by-voxel values), there are 362 timepoints for h.nii and 216 timepoints for beta.nii.
Can someone point me to the specific documentation about the beta.nii and h.nii file, so I can know what these extra regressors are? Or alternatively, point me to a different file for extracting voxel-by-voxel beta values?
Thanks,
Emily Ward
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