The first 12 regressors are 1 and 2: fundamental real (cosine), fundamental imaginary (sine) 3 and 4: 1st harmonic real and imag 5 and 6: real and imag at a freq just below the fundamental 7 and 8: real and imag at a freq just above the fundamental 9 and 10: real and imag at a freq just below the 1st harmonic 11 and 12: real and imag at a freq just above the 1st harmonic
The rest are the betas are for nuisance variables
doug
On 06/25/2013 04:22 PM, dgw wrote:
Hi,
I am examining the affect a metal artifact has on fMRI data, and I am using Eccentricity mapping with the retinotopy analysis in FSFast. I was recently asked to switch from examining the difference in the fsig to examining the difference in the betas. I opened up beta.nii.gz and I can see that it has a size of:
1 #of vertices 1 39
Can you explain to me, how I figure out where each of the 39 come from (and possibly point me to which of these might be appropriate to use?)?
Thank You, Dan _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer