Hello AndreaB,

(I wrote this yesterday but for some reason the post did not get through)

There may be 30 anatomical regions but they're all covered with blobs and it is not appropriate to try to separate them up by geometrical edits of the cluster's shapes.

What you might want instead is a description of what regions of the brain these blobs overlap with. Enter 'whereami'. The option -bmask or -omask will give you the percentage of an ROI occupying a particular region defined by one of the atlases distributed with AFNI.

For example, for blob 1 you will get a report that might say:
whereami -omask YourROIs+tlrc.
...
++ Processing unique value of 1
++ 925 voxels in ROI
++ 925 voxels in atlas-resampled mask
Intersection of ROI (valued 1) with atlas TT_Daemon (sb0):
43.9 % overlap with Middle Occipital Gyrus, code 33
24.3 % overlap with Cuneus, code 40
10.8 % overlap with Posterior Cingulate, code 20
0.3 % overlap with Lingual Gyrus, code 32
-----
79.4 % of cluster accounted for

More info on slides 35-39 here:
[afni.nimh.nih.gov]


I hope this helps.

cheers,
-ziad