STEP 3: Apply a Gaussian filter to spatially blur the volumes using program 3dmerge.

• STEP 3: Apply a Gaussian filter to spatially blur the volumes using program 3dmerge.

• • result is somewhat cleaner, more contiguous activation blobs
  • also helps account for subject variability when warping to standard space
  • spatial blurring will be done on sb23’s time shifted, volume registered datasets
  • • foreach run ( $runs )
    • 3dmerge -1blur_fwhm 4.0 -doall \
    • -prefix pb03.$subj.r$run.blur \
    • pb02.$subj.r$run.volreg+orig
    • end
  • • -1blur_fwhm 4: use a full width half max of 4mm for the filter size
    • -doall : apply the editing option (in this case the Gaussian filter) to all sub-bricks in each dataset