HI there, pretty simple question this time but just want to make sure. Should I be interpreting intensity values in SUMA as % signal change when scaling is applied to the preprocessing? I know this is the case with beta weight values in afni when scaled and I would figure it is the same with SUMA but just would like to confirm. Thanks very much 8)
Yes, that is right. Though it depends on how the regressors were
created. But it is very likely. Did you process with afni_proc.py?
- rick
Yes I did, here is what I used.
afni_proc.py -subj_id $subj
-script proc.$subj -scr_overwrite
-blocks align volreg surf blur scale regress
-copy_anat $anat_dir/E001_anat_nudge+orig
-dsets
$epi_dir/E001_XY_r1_deobl+orig.HEAD
$epi_dir/E001_XY_r2_deobl+orig.HEAD
$epi_dir/E001_XY_r3_deobl+orig.HEAD
$epi_dir/E001_XY_r4_deobl+orig.HEAD
-surf_anat $top_dir/AFNI/FSURF_E001/surf/SUMA/E001_SurfVol.nii
-surf_spec $top_dir/AFNI/FSURF_E001/surf/SUMA/std.141.E001_?h.spec
-tcat_remove_first_trs 0
-volreg_align_to third
-volreg_align_e2a
-blur_size 8.0
-regress_stim_times
$top_dir/E001_corr_nogo.txt
$top_dir/E001_err_nogo.txt
-regress_stim_labels
corr_nogo err_nogo
-regress_basis ‘GAM’
-regress_apply_mot_types demean deriv
-regress_reml_exec
-regress_censor_motion 0.3
-regress_opts_3dD
-jobs 2
-gltsym ‘SYM: corr_nogo -err_nogo’
Then yes, though should come out as percentage of the mean.
- rick