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