[Freesurfer] Sub-cortical areas and other atlases

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Hello experts,

I am following these instructions https://surfer.nmr.mgh.harvard.edu/fswiki/FsTutorial/GroupAnalysis to analyze the association between IQ and whole brain cortical thickness of brain areas (which by default uses Desikan atlas of 34 regions).

I was wondering how: (1). To do the similar analysis to identify sub-cortical regions which show significant association between thickness and IQ. (2). To use other atlases here i.e., replace Desikan atlas with 7 or 17 network Yeo atlas to identify which network shows the association with IQ.

I know how to extract thickness etc from sub-cortical areas (i.e., aseg stats) and use Yeo atlas outside these instructions, but I am not sure how to do this in above described instructions i.e., replace Desikan with sub-cortical and Yeo atlases etc.

Any help would be really appreciated.

Thanks !