PowerPoint Presentation - Group Analysis with AFNI

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¥ STEP 2: Smooth 3D+time datasets with AFNI 3dmerge

GThe result of spatial blurring (filtering) is somewhat cleaner, more contiguous activation blobs

GSpatial blurring will be done on EDÕs time shifted, volume registered datasets:

foreach run (1 2 3 4 5 6 7 8 9 10)

3dmerge -1blur_rms 4 \

-doall \

-prefix ED_r{$run}_vr_bl \

ED_r{$run}_vr+orig

end

å-1blur_rms 4 sets the Gaussian filter to have a root mean square deviation of 4mm (You decide the width of the filter)

å-doall applies the editing option (in this case the Gaussian filter) to all sub-bricks uniformly in each dataset